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Metro-North F10 413 in Bridgeport pulling Train 1926.
|Locale||Naugatuck River Valley of Connecticut, USA|
Naugatuck Railroad (1849–1887)|
Penn Central (1969–1971)
Penn Central (1969–1976)|
Metro-North Railroad (1983–present)
|Character||Single track, diesel motive power|
GE Genesis P32AC-DM|
|Line length||28.5 mi (45.87 km)|
|Number of tracks||1|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
Metro-North Railroad's Waterbury Branch is a branch of the New Haven Line, running north from a junction in the Devon section of Milford to Waterbury. Originally built as the Naugatuck Railroad, it once continued north to Winsted. The part north of Waterbury is now leased from CDOT by the Railroad Museum of New England, which operates excursion trains from Thomaston station through their operating subsidiary Naugatuck Railroad ( reporting mark NAUG); this name was chosen in homage of the original railroad. The trackage ends in Torrington but Metro North service on the branch ends at Waterbury. There are conceptual plans to extend service from its current terminus in Waterbury to Hartford via Bristol and New Britain. Currently, riders that want to continue to New Britain and Hartford have to transfer to an express bus operated by CTtransit at Waterbury. Except for one weekday morning peak train that operates from Waterbury to Stamford, all trains on this branch operate as shuttles between Waterbury and Bridgeport.
In September 2015, it was announced that out of Governor Malloy's 30 year-$100 Billion transportation plan, $350 Million has been included to improve service along the branch.  The upgrades include a new signal system with multiple passing sidings to increase service, newer equipment, and station rehabilitation.  Currently, only one train is allowed on the branch at a time. The signalization of the line will allow for multiple trains to safely be on the branch at a time, while allowing for increased capacity and safer train operation. Four passing sidings, at Devon, Derby, Beacon Falls, and Waterbury, will be built, and they are expected to be completed in 2018. Work began on a siding just north of the Derby–Shelton station and is expected to be completed in late 2015. [ needs update] Some of the 16 grade crossings on the line will be permanently closed, while others will have gates and flashers installed to prevent accidents. The entire project will be completed in November 2020 and will cost $73 million. CTDOT also purchased locomotives from NJ Transit that, once overhauled, will be put into branch line service. 
The stations on the Waterbury Branch have two major differences in comparison to most other stations in the Metro-North system. None have station houses or ticket machines, making it possible to buy fares on board with no surcharge. All stations, except for Waterbury, have low-level platforms (with the exception of Merritt 7 on the Danbury Branch, no other regular stations east of the Hudson have such platforms).
|Connections / notes|
|19||Bridgeport||55.4 (89.2)||1840 ||
Metro-North: New Haven Line
Shore Line East (limited service)
Greater Bridgeport Transit: 1, 3, 4, 5, 6, 7, 8, 9, 10, 13, 15, 17, 19X, 22X, 23, Coastal Link
Bridgeport & Port Jefferson Ferry
New Haven Line|
Shore Line East (limited eastbound service)
Greater Bridgeport Transit: 1, 10, 16, 23, Coastal Link
Limited service (one train, peak direction)
|Fairfield County / New Haven County border|
|Waterbury Branch splits from the New Haven Line in Milford|
Greater Bridgeport Transit: 15, 23|
CT Transit New Haven: 255
|Ansonia||71.1 (114.4)||1849||CT Transit New Haven: 255|
|Seymour||75.0 (120.7)||1849||CT Transit New Haven: 255|
|Beacon Falls||78.5 (126.3)||1849|
|Naugatuck||82.5 (132.8)||1849||CT Transit Waterbury: N1, N2, T74|
CT Transit CTfastrak: 925, 928
The Waterbury Branch uses 2008 Brookville BL20GH and GE Genesis P32AC-DM locomotives and Shoreliner passenger coaches. It has also used Mafersa coaches originally purchased for service on Shore Line East. Prior to the arrival of push-pull coaches, the branch used self-propelled Budd RDC and SPV-2000 railcars, the later of which were later converted to coaches. A typical shuttle consists of three cars.
- "Waterbury Branch Commuters Using Metro-North to Hear Details On Connecticut". Fox Business. September 2, 2015.
- "Metro-North Waterbury branch rail line improvements underway". Shelton Herald. May 10, 2016. Retrieved June 26, 2018.
- "Let's Go CT Transportation Ramp Up Dashboard". www.letsgoct.com. Connecticut Department of Transportation. Retrieved February 2, 2017.
- "Bridgeport, CT (BRP)". Great American Stations. Retrieved March 1, 2013.