Town of Gordonsville, Virginia Agenda Item Summary June 18, 2012

Similar documents
Quiet Zone Process. Background:

Introduction. The City of Elk Grove

STEVENS POINT QUIET ZONE

Quiet Zone Evaluation for Huron, Ohio

Report on Installation of Wayside Horns at Railroad Crossings and Railroad Trench System

March 4, Mr. H. Dale Hemmerdinger Chairman Metropolitan Transportation Authority 347 Madison Avenue New York, NY Re: Report 2007-F-31

FRONT COVER. Derby Quiet Zone Study Cover

RAILROAD QUIET ZONE PROJECT

HIGHWAY RAIL GRADE CROSSING CONSOLIDATION PROGRAM

DRAPER CITY RESOLUTION NO

Quiet Zone along FEC Corridor. Paul Calvaresi Regional Transportation Planner

Rockland County Safety & Quiet Zone Project. Town of Orangetown Public Meeting January 30, 2008

SAN RAFAEL CITY COUNCIL AGENDA REPORT

Private Crossing Treatments on the North Carolina Sealed Corridor

The Railroad Commission of California

The Olathe Quiet Zone

Grade Crossings in High Speed Rail Corridors

City of Berkeley Railroad Quiet Zone Study

Lake Erie Commerce Center Traffic Analysis

Attachment No. 20 RRLRT No. 1. Committee. Busway Grade Crossings STATUS/DATE OF ACTION

Train Whistling at Public Grade Crossings

TRANSPORTATION ELEMENT

Railroad Safety in the United States. Ian Savage

Welcome to the Downtown Fort Lauderdale Neighborhood Working Group Meeting. First meeting june 17, 2010

ORDER REQUESTING PROPOSALS

Welcome to the Illinois High-Speed Rail Chicago to St. Louis Construction Update Meeting. Today s meeting will provide an overview of the Program,

HIGHWAY RAIL GRADE CROSSING 4 QUAD GATES. William H. Watson. Amtrak

QUIET ZONE IMPLEMENTATION PLAN

Chicago St. Louis High-Speed Rail. Braidwood Construction. Local Officials Briefing August 7, 2014

Marti Donley; Daniel Reese; Rodney White UPC FFY14 TIP AMD pdf

Subpart A General Purpose... 7

related to temporary banners, flags, A-frame signs, and other temporary sign devices for commercial advertising. (Lee Plemel,

25 th Avenue Grade Separation. September 13, 2017

Town of Gordonsville, Virginia Planning Commission Agenda Item Summary March 26, 2014

ANTIDRUG PLAN GUIDANCE

Landside Safety Programs

[Docket No. FAA ; Product Identifier 2017-NE-40-AD; Amendment ; AD ]

Interstate 90 and Mercer Island Mobility Study APRIL Commissioned by. Prepared by

395 Express Lanes Project Update

TRANSPORT CANADA RAILWAY SAFETY DIRECTORATE GUIDELINE NO. 1 PROCEDURE AND CONDITIONS FOR ELIMINATING WHISTLING AT PUBLIC CROSSINGS

PART 8. TRAFFIC CONTROLS FOR HIGHWAY-RAIL GRADE CROSSINGS TABLE OF CONTENTS

Petition for Exemption

Community Development

DATE: February 13, 2012 REPORT NO. EN CHAIR AND MEMBERS COMMITTEE OF THE WHOLE OPERATIONS AND ADMINISTRATION

HISTORY AND REVIEW OF RAILWAY-HIGHWAY GRADE CROSSING WARNING SYSTEMS AND THE GENESIS OF STANDARD SPECIFICATION

2. RESOLUTION TO CLOSE MEETING

AGENDA ITEM I-6 Public Works

Stage 2 ION: Light Rail Transit (LRT) from Kitchener to Cambridge

West Charlotte CORRIDOR STUDY

Chicago St. Louis High-Speed Rail. Enos Park Neighborhood Association May 13, 2014

Draft Concept Alternatives Analysis for the Inaugural Airport Program September 2005

AREMA C&S Manual Index (Includes 2018 Revisions) Volume SECTION 3 - HIGHWAY RAIL GRADE CROSSING WARNING SYSTEMS

The below is select text taken from the February 20, 2018 City Commission meeting:

4. Proposed Transit Improvements

Standardizes the handling of visa-regressed cases throughout USCIS field offices nationwide;

Frequently Asked Questions on the Route 29 Solutions Improvements Projects

BUSINESS OF THE CITY COUNCIL CITY OF MERCER ISLAND, WA

Revisions to Denied Boarding Compensation, Domestic Baggage Liability Limits, Office of the Secretary (OST), Department of Transportation (DOT).

UNITED STATES OF AMERICA DEPARTMENT OF TRANSPORTATION OFFICE OF THE SECRETARY WASHINGTON, D.C.

HAMPTON ROADS CROSSINGS PATRIOTS CROSSING AND HRBT

QUIET ZONE UPDATE. PUBLIC WORKS DEPARTMENT June 14, 2016

Follow-up to Proposed Fare Changes for FY2013

COVER SHEET. Reduced Vertical Separation Minimum (RVSM) Information Sheet Part 91 RVSM Letter of Authorization

12, 14 and 16 York Street - Amendments to Section 16 Agreement and Road Closure Authorization

2016 Regional Transportation Alternatives Program (TAP) Grant Application

LAX Community Noise Roundtable. Aircraft Noise 101. November 12, 2014

Part 171. Aeronautical Telecommunication Services - Operation and Certification. CAA Consolidation. 10 March 2017

Notice of Policy Change for the Use of FAA Approved Training Devices

[Docket No. FAA ; Product Identifier 2018-NM-025-AD; Amendment ; AD ]

Official Minutes of MARION COUNTY BOARD OF COUNTY COMMISSIONERS. May 8, 2018

1) Rescind the MOD (must meet the standard); 2) Issue a new MOD which reaffirms the intent of the previous MOD; 3) Issue a new MOD with revisions.

[Docket No. FAA ; Directorate Identifier 2011-CE-015-AD] Airworthiness Directives; Cessna Aircraft Company Airplanes; Initial Regulatory

25 th Avenue Grade Separation. December 13, 2017

NCUTCD Proposal for Changes to the Manual on Uniform Traffic Control Devices

A Master Plan is one of the most important documents that can be prepared by an Airport.

Short-Term Rentals Public Input. Thursday, November 5, 2015

Construction Update. Local Officials Briefing March 2016

FEDERAL HIGHWAY ADMINISTRATION NEVADA DEPARTMENT OF TRANSPORTATION ENVIRONMENTAL IMPACT STATEMENT RE-EVALUATION

Federal Railroad Administration Southeast Regional Rail Planning Study

Blueways: Rivers, lakes, or streams with public access for recreation that includes fishing, nature observation, and opportunities for boating.

LYNDHURST NEW URBAN DEVELOPMENT AREA STRUCTURE PLAN. Lyndhurst New Urban Development Area Structure Plan OUTCOMES AND PERFORMANCE STANDARDS

Policy Memorandum. Authority 8 CFR governs USCIS adjudication of Form I-601.

[Docket No. FAA ; Product Identifier 2018-CE-006-AD; Amendment. AGENCY: Federal Aviation Administration (FAA), Department of Transportation

Provincial Railway Guides Section:

TORONTO TRANSIT COMMISSION REPORT NO. SUBJECT: TORONTO-YORK SPADINA SUBWAY EXTENSION STATION NAMES IN THE CITY OF VAUGHAN

DATE: April 19, 2016 REPORT NO. PW Chair and Members Committee of the Whole Operations and Administration

RECOMMENDATION TO THE DULLES CORRIDOR AND FINANCE COMMITTEES

Vasona Light Rail Signal Design Challenges. Hugh D. MacGillivray, Hatch Mott MacDonald Dennis Mellon, Santa Clara County Transportation Authority

Agenda Cover Memorandum

[Docket No. FAA ; Directorate Identifier 2006-NM-204-AD; Amendment ; AD ]

Mercer Island should continue to press Renton for public input on noise and other environmental effects of the options then under consideration.

5 Rail demand in Western Sydney

Seek the Board s approval for the Donald Place kerb and channel renewal to progress to final design, tender and construction; and

CAREERSOURCE FLORIDA BUSINESS TRAVEL REIMBURSEMENT GUIDELINES FOR BOARD MEMBERS AND STAFF

JPB BOARD MEETING FEBRUARY 7, Correspondence Packet as of January 31, 2019, 1 p.m.

DUFFERIN ELEMENTARY PLANNING STUDY SCHOOL DISTRICT 68 (NANAIMO-LADYSMITH)

~ Draft Minutes ~ City of Fort Walton Beach Regular Meeting of the City Council of Fort Walton Beach

Appendix 6.1: Hazard Worksheet

INDIANA HARBOR BELT RAILROAD COMPANY. BULLETIN ORDER NO. S-28 May 4, 2018

October 1, 2015 DELIVERED BY TO:

Transcription:

Town of Gordonsville, Virginia Agenda Item Summary June 18, 2012 AGENDA ITEM 10a Unfinished Business AGENDA TITLE: Discussion of Railroad Quiet Zone DISPOSITION: [ ] Action Required [X] For Discussion [ ] Consent Agenda [ ] Closed Session [ ] Informational PRESENTER: Mayor Robert Coiner ATTACHMENTS: [X] yes [ ] no BACKGROUND: The attached report from Christopher Colby is an update on the progress of the establishment of the railroad quiet zone for Council s review and discussion. Also attached for Council s consideration is a revised Notice of Intent (NOI) for the establishment of two quiet zones and a request for information related to current railroad inventory for the town. How does Council wish to proceed in this regard? p:\agenda package\2012\june 18, 2012\unfinished business\word\summary_unfinished business a_discussion of railroad quiet zone.doc

A Railroad Quiet Zone Feasibility Study Town of Gordonsville, Virginia C. F. Colby Summer 2012 Private volunteer effort. No CSX, BB, Amtrak, or Town endorsement implied.

Executive Summary The Town of Gordonsville, Virginia, has the short-term ability to implement a Quiet Zone (QZ) without further safety equipment installation 1, either to simply eliminate all mandatory train horns from 10:00 p.m. to 7:00 a.m. (Partial QZ), around-the-clock (Full QZ), or a hybrid Partial/Full QZ (to selectively preserve some daytime train horns, such as the daytime Amtrak horns on Baker Street, with a Full QZ on the other crossings). This window of opportunity may close in the next several years, as gradual AADT increases may create a Quiet Zone Risk Index (QZRI) that exceeds the National Significant Risk Threshold (NSRT) without some roadway improvements. The Town has four highway-grade railroad crossings across two tracks within a one-mile distance. The Town s average daily train traffic consists of two daytime Buckingham Branch Railroad (BBRR) freight trains, five or more CSX-branded empty coal trains transiting aroundthe-clock to West Virginia, which pass along the Town s Main Street commercial district, and the Amtrak Cardinal line, which crosses the Baker Street crossing three times a week. The Town s average daily traffic (AADT) consists of 3,500 vehicles on High Street, with an average of 750 vehicles across the other three crossings. As of 1 September 2012, the Town s railroad crossings will have all of the Federal Railroad Administration (FRA)-required safety equipment. I. Town History, Geography, and Future Plans The Town of Gordonsville, Virginia, is a town at the crossroads of history. Once a noted inn and then the western terminus for rail traffic in the Commonwealth, its fortunes have been linked to those of the travelers who pass through it. At one time, the Town recorded its day based on the whistles of the scheduled passenger trains coming through Gordonsville. Even today, the tight horseshoe-shaped railbed requires trains to slow down in town. The Town in 2012 is facing challenges in the form of lost local industry and a Main Street corridor in need of improvement, for which the Town has initiated a new $1.4M streetscape plan. The Town appears to focus on a future of local-scale tourism, agriculture, information technology, and other quiet industries. Other municipalities nationwide have included QZ implementation as a core element to their downtown revitalization efforts. Business leaders in several larger communities found that rail noise had to be reduced if central business district revitalization efforts were to succeed. University studies have reported decreased property values near non-qz rail crossings. While residents may sleep through the horns, numerous studies indicate decreased levels of efficiency, motor control, and memory from nighttime noise, even if the subjects slept through the noise. VML has also endorsed the use of quiet zones with a pamphlet available on its website. 2 Sound level readings throughout the Main Street commercial corridor reflect a minimum of 93 dba 3 during each of the eight horn blasts a train must make in the district. Readings in 1 49 CFR 222.39(a)(2)(i). 2 VML website, available online at http://www.vml.org/legalres/trainnoiseabate_legalres.pdf 3 Measured in May-June 2012 near the Main Street railroad bridge during Depot and Main Street crossings. 1

Gordonsville residential areas reported in excess of 75 dba, well in excess of the Town s 65 dba daytime residential noise ordinance. For comparison, conversation usually occurs at 60 dba, and all audible communication usually ceases when background noise exceeds 90 dba. II. FRA Safety Statistics and FRA Train Horn Rule Requirements A QZ does not eliminate all train horns; it only makes train horn use discretionary instead of mandatory. Train operators still have broad discretion to sound the train horn in the event of a vehicle, maintenance employee, other person, or other unsafe situation on or near the tracks, when there is no power, or when grade crossing warning devices are malfunctioning. 4 Additionally, train operators can still sound the train s bell at every crossing. Virginia railroads reported 438 highway-rail incidents (271 at public crossings) for the ten year period of 2002-2011, of which 22 deaths were reported. 5 All relevant metrics (number of accidents, fatalities, etc.) have declined over the past decade. Across the 492 QZs nationwide, only one QZ vehicle fatality was reported at a gated crossing in 2011, involving a commuter train moving at 51 mph outside Chicago, IL. 6 In general, slower trains seem to result in more margin for error and fewer fatalities; as Gordonsville trains travel at 20 mph, there is considerable time for trains to slow and sound their horns, decreasing the initial risk and effects of an impact. The FRA Train Horn Rule requirements are: 1. New quiet zones are a minimum of a half-mile in length. The proposed quiet zones meet this requirement. 2. Active warning devices featuring a minimum of flasher, lights and gates. All Town crossings meet this requirement. 3. Constant Warning Time (CWT) circuits where practical. CWT is a train detection technology that adjusts the start of the warning sequence based on the train s speed. CWT-enhanced signals always give the same warning time, regardless of train speed. Baker Street and High Street will meet this requirement as of 1 September 2012. Depot Street and Main Street crossings meet this requirement. 4. Power-Out Indicators on Signal Cabins. The power out indicator (a light attached to the side of the signal cabin) indicates that there is power at the crossing. All Town crossings meet this requirement. 4 49 CFR 222.23 5 FRA dataset, available online at http://safetydata.fra.dot.gov/officeofsafety/publicsite/query/stchart.aspx 6 FRA dataset, available online at http://safetydata.fra.dot.gov/officeofsafety/publicsite/on_the_fly_download.aspx 2

III. Four Proposed Quiet Zone Scenarios (from Most Horns to Fewest) When would we hear the horns? 0 Status quo (All train horns) I All daytime trains II All daytime Baker Street (Amtrak) trains III No train horns Baker Street No QZ Partial QZ Partial QZ Full QZ High/Main/Depot No QZ Partial QZ Full QZ Full QZ Pros Safety from horn, gates, lights, train Daytime safety in addition to gates/ seeing train Amtrak train horn returns to being a Town event Silence for quiet industries Cons Noise in town (8 to 12x/day) IV. Further Steps and Periodic Updates 7 Distraction for Main Street guests Daytime noise for Baker-area homes Lack of local historic element Once the Town Council has decided on a course of action, the Town would submit Notices of Establishment, which would provide at least 21 days notice to the railroads before routine train horns would cease. No Train Horn signage ($40/sign for premium highest-visibility signs) 8 must be installed at each crossing (below existing signs) before trains will stop sounding horns. Every 30-36 months, the Town will be required to affirm in writing that any supplemental safety measures (SSMs) continue to conform to requirements, and provide an accurate Grade Crossing Inventory Form. Upon request, BBRR will have 30 days to provide updated information to the Town to allow the Town to update the Grade Crossing Inventory Form. 9 V. Long Term Scenarios (should QZRI exceed NSRT) 10 Once the Town has had sufficient time to gauge resident, business, and visitor feedback, it may face the prospect of the Main/Depot/High QZRI exceeding the NSRT, and thus losing its QZ qualification. Following the first annual review where the QZRI exceeded the NSRT, FRA would notify the Town, which would have six months to decide to retain the QZ, and then an additional 36 months from the FRA s notice to implement SSMs, such as medians or four-quadrant gates. One of the Town s most cost-effective options may be by installing an FRA-approved Mountable Median with Reflective Traffic Channelization Device which average $13,000 per crossing (not including installation) and require only four hours installation time. These medians extend 100 feet from the gate arm, with intersections within 60 feet requiring modification. 11 A future traffic engineering study may be considered to determine the best approach, whether at Main, Depot, or High Streets. (See Figures 1-5 for an example median and FRA worksheets.) 7 49 CFR 222.47 8 Available online at http://www.roadtrafficsigns.com/traffic-sign/no-train-horn-sign/sku-x-w10-9.aspx 9 49 CFR 222.49(b) 10 49 CFR 222.51(a)(2) 11 49 CFR 222 Appendix A (3) 3

Figure 1: Sample Mountable Barrier SSM (courtesy Qwickkurb) Figure 2: Baker Street FRA Worksheet with No SSMs (Current Status) 4

Figure 3: Main/Depot/High Streets FRA Worksheet with No SSMs (Current Status) Figure 4: Main/Depot/High Streets FRA Worksheet with High Street Reflective Median Barrier 5

Figure 5: Main/Depot/High Streets FRA Worksheet with High Street and Main Street Reflective Median Barrier 6

July 15, 2012 Buckingham Branch Railroad P.O. Box 336 Dillwyn, Virginia 23936 CSX Transportation, Inc. 500 Water Street Jacksonville, FL 32202 National Railroad Passenger Corporation Stefan Gilmore, Sr. Safety Coordinator 40 Massachusetts Avenue NE Washington, DC 20002 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway-Rail Grade Crossing Safety Program 1401 E. Broad St. Richmond, Virginia 23219 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway Safety Program 1401 E. Broad St. Richmond, Virginia 23219 RE: NOTICE OF INTENT (NOI) TO CONSIDER TWO NEW QUIET ZONES UNDER 49 CFR 222.41(c) AND REQUEST FOR CURRENT INVENTORY INFORMATION AS OF SEPTEMBER 1, 2012 UNDER 49 CFR 222.49(b)) In accordance with 49 CFR 222.43(a)(1) and 222.43(b), and upon the March 30, 2012, recommendation of Buckingham Branch Railroad, the Town of Gordonsville provides written notice of its intent to consider the following proposed two Quiet Zones under 49 CFR 222.39. The information provided is for two separate Quiet Zones. The information for the two Quiet Zones will be presented separately and readily identifiable as Parts I and II. Parts III and IV are the Town s request for current inventory information (as of September 1, 2012). The Town is including this request to minimize administrative burden on the parties. It is the Town s understanding that all CWT equipment will be installed as of September 1, 2012.

I. BAKER STREET QUIET ZONE 1. A list of each public, private, and pedestrian grade crossing within the quiet zone, identified by both U.S. DOT National Highway-Rail Grade Crossing Inventory Number and street or highway name, if applicable. U.S. DOT Crossing Inventory Number 225171A Street or Highway Name East Baker Street 2. A statement of the time period within which restrictions would be imposed on the routine sounding of the locomotive horn (i.e., 24 hours or from 10 p.m. until 7 a.m.). Partial. The Gordonsville Town Council has stated they prefer a partial (10 p.m. until 7 a.m.) Quiet Zone if one is established. 3. A brief explanation of the public authority s tentative plans for implementing improvements within the proposed quiet zone. None. The Town of Gordonsville is applying under 49 CFR 222.39(a)(2)(i), which permits establishment when the QZRI is at or below the NSRT without installation of any SSMs at the New Quiet Zone. The Town of Gordonsville understands that Buckingham Branch Railroad will install new CWT equipment on the Baker Street crossing by September 1, 2012. 4. The name and title of the person who will act as point of contact during the quiet zone development process and the manner in which that person can be contacted. Sabrina Martyn, Town Manager, (540) 832-2233, smartyn@gordonsville.org OR Christopher Colby, Town Resident, (540) 832-1747, christopher.f.colby@gmail.com 5. A list of the names and addresses of each party that will receive notification. Buckingham Branch Railroad P.O. Box 336 Dillwyn, Virginia 23936 CSX Transportation, Inc. 500 Water Street Jacksonville, FL 32202 National Railroad Passenger Corporation Stefan Gilmore, Sr. Safety Coordinator 40 Massachusetts Avenue NE Washington, DC 20002 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway-Rail Grade Crossing Safety Program 1401 E. Broad St. Richmond, Virginia 23219 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway Safety Program 1401 E. Broad St. Richmond, Virginia 23219

II. MAIN/DEPOT/HIGH STREETS QUIET ZONE 1. A list of each public, private, and pedestrian grade crossing within the quiet zone, identified by both U.S. DOT National Highway-Rail Grade Crossing Inventory Number and street or highway name, if applicable. U.S. DOT Crossing Inventory Number 225093V 225094C 225096R Street or Highway Name South Main Street Depot Street High Street 2. A statement of the time period within which restrictions would be imposed on the routine sounding of the locomotive horn (i.e., 24 hours or from 10 p.m. until 7 a.m.). Partial. The Gordonsville Town Council has stated they prefer a partial (10 p.m. until 7 a.m.) Quiet Zone if one is established. 3. A brief explanation of the public authority s tentative plans for implementing improvements within the proposed quiet zone. None at this time. The Town of Gordonsville is applying under 49 CFR 222.39(a)(2)(i), which permits establishment when the QZRI is at or below the NSRT without installation of any SSMs at the New Quiet Zone. The Town of Gordonsville understands that Buckingham Branch Railroad will install new CWT equipment on the High Street crossing by September 1, 2012. 4. The name and title of the person who will act as point of contact during the quiet zone development process and the manner in which that person can be contacted. Sabrina Martyn, Town Manager, (540) 832-2233, smartyn@gordonsville.org OR Christopher Colby, Town Resident, (540) 832-1747, christopher.f.colby@gmail.com 5. A list of the names and addresses of each party that will receive notification. Buckingham Branch Railroad P.O. Box 336 Dillwyn, Virginia 23936 CSX Transportation, Inc. 500 Water Street Jacksonville, FL 32202 National Railroad Passenger Corporation Stefan Gilmore, Sr. Safety Coordinator 40 Massachusetts Avenue NE Washington, DC 20002 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway-Rail Grade Crossing Safety Program 1401 E. Broad Street Richmond, Virginia 23219 Virginia Department of Transportation Traffic Engineering Division Highway Safety Improvement Programs Highway Safety Program 1401 E. Broad Street Richmond, Virginia 23219

III. BAKER STREET QUIET ZONE - REQUEST FOR CURRENT INVENTORY INFORMATION AS OF SEPTEMBER 1, 2012 (49 CFR 222.49(b)) In accordance with 49 CFR 222.49(b), the Town of Gordonsville requests sufficient information, current as of September 1, 2012, regarding the following grade crossing(s) and the railroad s operations over the grade crossing(s) to enable the Town to complete the Grade Crossing Inventory Form. The Town of Gordonsville extends the 30-day requirement to 60 days to allow the parties to consolidate this request with the accompanying NOI. U.S. DOT Crossing Inventory Number 225171A Street or Highway Name East Baker Street IV. MAIN/DEPOT/HIGH STREETS QUIET ZONE - REQUEST FOR CURRENT INVENTORY INFORMATION AS OF SEPTEMBER 1, 2012 (49 CFR 222.49(b)) In accordance with 49 CFR 222.49(b), the Town of Gordonsville requests sufficient information, current as of September 1, 2012, regarding the following grade crossing(s) and the railroad s operations over the grade crossing(s) to enable the Town to complete the Grade Crossing Inventory Form. The Town of Gordonsville extends the 30-day requirement to 60 days to allow the parties to consolidate this request with the accompanying NOI. U.S. DOT Crossing Inventory Number 225093V 225094C 225096R Street or Highway Name South Main Street Depot Street High Street Thank you very much for your time, attention, and assistance. Sincerely, TOWN OF GORDONSVILLE Sabrina M. Martyn Town Manager smm cc via email: Town Council Angela Marie Scolforo, Town Attorney Deborah S. Kendall, AICP, Town Planner/Town Clerk David Cubbage, VDOT Residency Maintenance Manager Christopher Colby