Bay Colony Railroad
|Dates of operation||1982–present|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
The BCLR operates in the Millis - Milford - Needham Corridor. In addition to moving freight for its customers, Bay Colony also performs AAR-certified repairs on rolling stock and contract track construction projects for other railroads. It has a sister railroad, the Seminole Gulf Railway, which is based out of Fort Myers, Florida.
The Bay Colony railroad was chartered on March 31, 1977, with the intent of taking over freight service on former New Haven lines from Conrail, which was planning to abandon service. The lines were purchased by the state government, and Bay Colony took over all freight operations on the lines on June 12, 1982 with a 25-year contract.
The contract for the railroad lines owned by the State of Massachusetts administered by the Executive Office of Transportation (EOT), which included the Cape Cod main expired on December 31, 2007. It was awarded to a new company, the Massachusetts Coastal Railroad, which took over on January 1, 2008. At that time the Bay Colony ceased operation on those lines, but continues in other areas of the state. 
- Bay Colony 151, a GE 23 Tonner, sold 1995.
- Bay Colony 1064, a RS1. Bought by the Green Mountain Railroad in Vermont in the late 1990s as a part source locomotive for #405. Later scrapped by the early 2000s.
- Bay Colony 1701, an EMD GP8, acquired in March 1987 and previously owned by Indiana Midland and Detroit Toledo & Shore Line. Now sits abandoned near the Medfield Waste Water Plant on the Millis branch line, Bay Colony's last standing line. (N 42.18982 W 71.33304)
- Bay Colony 1702, an GP9R (Sold to Grafton and Upton Railroad in Spring 2008)
- Bay Colony 1703, an EMD GP9
- Bay Colony 1705, an EMD GP9 Low nose
- Bay Colony 1706, an EMD GP9 Low nose
- Bay Colony 1751, an EMD GP9
- Bay Colony 1777, an EMD GP9
- Bay Colony 2443, a CF7 (Sold to Grafton and Upton Railroad in Spring 2008)
- Bay Colony 2501, an ALCO Century 425
- "about bay colony". Archived from the original on 2003-04-07. Retrieved 2007-10-18.
- "Massachusetts Coastal named to operate commonwealth-owned lines". Trains News Wire. Kalmbach Publishing. 2007-10-08. Retrieved 2007-10-18.
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