Watertown Branch Railroad
The Watertown Branch Railroad was a branch loop of the Fitchburg Railroad that was meant to serve the town of Watertown and the City of Waltham, Middlesex County, Massachusetts, as an independent short line railroad; it also serviced the Watertown Arsenal. The line has been formally abandoned and portions are being converted into a rail trail, the Watertown-Cambridge Greenway. A section from School Street to Arlington Street in Watertown has been completed. A small portion in Waltham has been converted into a park called Chemistry Station Park after the railroad station once located there. Construction of an extension to Fresh Pond Reservation in Cambridge began in the summer of 2018.
The railroad was chartered in 1846 and a second company, the Waltham and Watertown Railroad, was chartered to extend the line to the neighborhood just southeast of downtown Waltham, Massachusetts. In order to keep it out of the hands of its rivals, the Fitchburg took control of both companies before any track was laid and merged them into the Watertown Branch.
Construction began from West Cambridge in 1847 and was completed to Bemis two years later. In the Fresh Pond area it paralleled the existing Charlestown Branch Railroad which was used to haul ice. By 1851 it reached the Fitchburg's main line at the downtown Waltham station and the branch served as the main passenger line between Boston and Waltham. It was one of the few branch lines to be double tracked, as the line saw quite heavy traffic, especially in the 1880s and 1890s. But things went downhill once the Boston and Maine Railroad took over the Fitchburg in 1900.
Passenger service on the line ended in 1938 and the second track was removed by early 1940. The middle section of the line from the Waltham/Watertown line through Watertown Square to East Watertown was abandoned in 1960. This split the branch line in two, but traffic continued on both sides through the remainder of the 20th century. In 1991, about a half mile of track was abandoned on the west side of the line at Bemis, and the remainder of the line back to Waltham was abandoned in 2000.
On October 5, 2011, the Surface Transportation Board agreed to allow Pan Am Railways to abandon the final active 1.72 miles of the Watertown Branch from Newly Weds Foods in Watertown to the branch's junction with the Fitchburg Line between Sherman Street and Alewife in Cambridge. No freight had been carried for at least two years. As of May 2013, all but the approximately half-mile portion between Concord Avenue and the Fitchburg Line was in public hands.
State and local collaboration has been ongoing for transformation of the rail corridor into a rail trail, once known as the Charles River/Alewife Connector, now called the Watertown-Cambridge Greenway. The condition of the tracks at that time was deemed so poor that trains traveling at a mere 3 miles per hour (4.8 km/h) could derail.
In 1999, the Executive Office of Transportation purchased segments of the right-of-way from Guilford Transportation. This trail segment was later transferred administratively to the MDC, currently known as the Massachusetts Department of Conservation and Recreation (DCR).
On the east side of the branch, service was only to one customer, Newly Weds Foods, until service ended in 2007. The entire branch is now abandoned and out of service. Litter and downed trees are prevalent on the Fresh Pond–Watertown portion of the track.
On May 22, 2013 the Massachusetts Department of Conservation and Recreation (DCR) and the City of Cambridge announced their acquisition of major portions of the remaining abandoned right-of-way from the railroad for $1.3 million plus an additional, unspecified amount from Cambridge, allowing completion of the Watertown-Cambridge Greenway. The DCR acquired the portion south of Huron Avenue, while the City of Cambridge now owns the right-of-way north to Concord Avenue.
In 2015, the DCR obtained $180,000 to fund design of the remaining greenway section, half from private donations. Public meetings were held on June 9 and November 30, the latter to present a 25% design for the greenway. A 75% design presentation was held on June 2, 2016.  Funding of $3.6 million was approved by the Boston Region Metropolitan Planning Organization (MPO) in June 2017, with construction projected to start in Fall 2017 or Spring 2018.
The project was advertised for bids in September 2017 and bids were opened in March 2018. As of June, final design was complete. Construction started in late summer. The estimated cost is $3.182 million. As of mid-August 2018, the right-of-way had been cleared of most accumulated overgrowth and surveying work had begun. As of mid-October, track had been largely removed and several dozen trees with diameter greater than 6 inches were being removed due to poor health, safety concerns or construction conflicts.
The path construction process has moved faster in Watertown than in Cambridge.
- 1996: Study to link Charles River & Alewife suggests using the rail right-of-way (ROW) through Watertown
- 1998: Town of Watertown rezones unused RR property as Open Space
- 2000: State purchases ROW from School Street to Grove Street to develop a multi-use path
- 2003: State selects Vanasse Hangen Brustlin (VHB) as path designer
- 2004: State gives VHB notice to proceed with design contract
- 2010: MassDOT begins construction on the School Street to Arlington Street section.
- 2011: The School Street to Arlington Street section opens
- 2013: The City of Cambridge and DCR acquire the remaining corridor from the B&M Railroad
- 2015: Design of remaining greenway segment is funded and reaches 25% level
- 2016: Design of remaining greenway segment reaches 75% level
- 2017: Construction of remaining greenway segment funded Bids advertised.
- 2018: Bids opened and contract awarded. Construction began in summer. 
The line begins in North Cambridge west of the Sherman Street at-grade crossing. The branch line proceeds west, and then south, where it has at-grade crossings at New Street, Concord Avenue, and the entrance road to the Walter J. Sullivan Water Treatment Facility at the Fresh Pond reservoir. From there, the line proceeds to several underpasses, namely one below a second road into the Fresh Pond reservation, one at Huron Avenue, and one at Mount Auburn Street, where it then crosses the town boundary of Watertown.
The line crosses Cottage Street at grade and Grove Street below grade. Further at-grade crossings were at School Street and at Mount Auburn Street just outside Watertown Square.
West Watertown to Waltham
The western portion of the branch continued past the Town Hall area, then headed southwest toward Main and Pleasant Streets (near Bacon and Howard Streets) and across Bridge Street in the Bemis Neighborhood of Watertown. Although much of the area has been built over, from there the line ran adjacent to Pleasant Street through what are now mainly parking lot areas, through the Quincy Cold Storage property (now Repton Place) on Pleasant Street, through the former Raytheon property in Waltham, and across River Street near Willow Street, before crossing the Charles River near the Bleachery Dam. The trestle for that crossing, approximately 140 years old, was dismantled and removed in August 2016. The line then crossed Calvary Street, then Newton Street, and proceeded across Pine Street before heading northwest, where it re-crossed the Charles, parallel to Elm Street. It then reached the Central Square area, and looped back into the Fitchburg Railroad main line.
Phase I of the Watertown-Cambridge Greenway connects School Street to Arlington Street, in Watertown, with a branch to the Arsenal Mall. Phase II will connect with Phase I at Arlington Street and continue just past the Walter J. Sullivan Water Treatment Facility where it will connect with the existing Fresh Pond Trail. Planned renovations at the Arsenal Mall are expected to include a connection to the Charles River Bike Path. A several-block completed section of the proposed Watertown Community Path proceeds west along Arsenal street from School Street.
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- The area where the Watertown tracks branched off the Fitchburg main line is now considered part of North Cambridge and Alewife, and differs from the neighborhood called West Cambridge today. It was also distinct from the nearby town of West Cambridge, renamed Arlington in 1867.
- Fresh Pond Reservation Master Plan - 4 - The Ecological and Social History of Fresh Pond Reservation
- SURFACE TRANSPORTATION BOARD DECISION Docket No. AB 32 (Sub-No. 103X) BOSTON AND MAINE CORPORATION–ABANDONMENT EXEMPTION–MIDDLESEX COUNTY, MASS. Retrieved 2012-05-02. Note incorrect references to "Waterloo" branch and "BNSF"
- Williams, Lisa (1998-12-29). "Watertown Branch Rail Trail Status, December 1998". Massachusetts Bicycle Coalition. Archived from the original (1998-12-29) on March 14, 2009. Retrieved 2009-08-10.
- Howe, Peter (2007-10-08). "A look at several rail trail projects underway across the state, from west to east" (2007-10-08). Boston Globe. Retrieved 2009-08-09.
- Mink, Doug (2006-05-15). "Future Metro Boston Bikeways and Trails: Watertown Branch Rail Trail". Massachusetts Bicycle Coalition. Archived from the original (2006-05-15) on August 8, 2009. Retrieved 2009-08-09.
- "Watertown Bicycle & Pedestrian Committee - powerpoint presentation". Watertown Bicycle & Pedestrian Committee. 2009-04-24. pp. Pg. 26. Archived from the original (2009-14-24) on 2011-07-18. Retrieved 2009-08-09.
- "Trans Report: EOTC Secures Right of Way for Future Trail" (PDF). Boston Metropolitan Planning Organization (BMPO). 2001-01-01. pp. Pg. 3. Archived from the original (2001-01-01) on September 18, 2010. Retrieved 2009-08-08.
- Estin, Paul (2003-11-25). "The Watertown Branch Trail - Grove St. to Fresh Pond" (2003-11-25). Paul Estin. Retrieved 2009-08-08.
- Potter, Katherine (10 May 2005). "Watertown Branch Environmental/Historical Report" (PDF). Surface Transportation Board (STB) Docket AB 32 (Sub No. 98X) and AB 355 (Sub No. 32X). United States Department of Transportation. Archived from the original (PDF) on 16 May 2006.
- Major Greenways Link for Watertown-Cambridge Greenway Acquired
- "DCR Public Meeting" (PDF). Massachusetts Department of Conservation and Recreation. 9 June 2015.
- "DCR Public Meeting – 25% Design" (PDF). Massachusetts Department of Conservation and Recreation. 30 November 2015.
- "DCR Public Meeting – 75% Design" (PDF). Massachusetts Department of Conservation and Recreation. 2 June 2016.
- "Watertown Greenway Phase II secures funding, could open next summer". WickedLocal. 20 June 2017.
- Watertown-Cambridge Greenway Phase II RFP
- http://www.waltham-community.org/phBleachery.html[dead link]
- FutureMBTA.com: 5. Harvard to Waltham via Watertown, proposals for new Red Line branches by FutureMBTA.com
- FutureMBTA.com map of the proposed red line routes (with #5 and #6 highlighting the old Watertown Branch line)
- Carter, Kristopher; Giambrone, Eric; Kim, Eunice; Moon, Michelle; Tommee, Jong Wai (May 2010). "Watertown Community Path Planning Report". Tufts University Urban + Environmental Policy + Planning.
- Karr, Ronald D. (1994). Lost Railroads New England. Branch Line Press. ISBN 0-942147-04-9.
- Karr, Ronald D. (1995). The Rail Lines of Southern New England - A Handbook of Railroad History. Branch Line Press. ISBN 0-942147-02-2.
- Sinclair, Jill (April 2009). Fresh Pond: The History of a Cambridge Landscape. Cambridge, Mass.: MIT Press. ISBN 978-0-262-19591-1.
|Wikimedia Commons has media related to Watertown Branch Railroad.|
- Map of Greenway and connections
- Watertown Bicycle & Pedestrian Committee, Official website
- Overview of the Watertown Bicycle & Pedestrian Committee, with updates on the process.
- Watertown Bicycle & Pedestrian Committee presentation (PDF): April 24, 2009
- Watertown's sidepath to nowhere - Photos and commentary by John Allen
- Flickr photo archive: Old Watertown Branch Line
- "West Cambridge, Massachusetts Train Wreck September 1892". GenDisasters. Retrieved 20 July 2017.