Metro-North F10 413 in Bridgeport pulling Train 1926.
|Locale||Naugatuck River Valley of Connecticut, USA|
|Stations||7 (+ 1 limited)|
|Owner||Naugatuck Railroad (1849-1887)
Penn Central (1969-1971)
|Operator(s)||Penn Central (1969-1976)
Metro-North Railroad (1983-present)
|Character||Single track, diesel motive power|
|Rolling stock||GE Genesis P32AC-DM
|Line length||28.5 mi (45.87 km)|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in)|
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; that part is still called the Naugatuck Railroad (reporting mark NAUG). 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.
Most trains operate as shuttles between Waterbury and Bridgeport; however, the first train departing Waterbury in the morning terminates in Stamford, and its locomotive and coaches continue to Grand Central Terminal as a renumbered train.
Station stops 
|Fairfield||Bridgeport||55.4||Bridgeport||Amtrak Northeast Regional and Vermonter
Shore Line East
GBTA:1, 3, 4, 5, 6, 7, 8, 9, 10, 13, 15, 17,
19X, 22X, 23, Coastal Link
Bridgeport & Port Jefferson Ferry
|Shore Line East
GBTA: 1, 10, 16, 23, Coastal Link
|New Haven||Milford||Waterbury Branch splits|
CTTransit New Haven: F
|Ansonia||71.1||Ansonia||CTTransit New Haven: F|
|Seymour||75||Seymour||CTTransit New Haven: F|
|Beacon Falls||78.5||Beacon Falls||N/A|
|Naugatuck||82.5||Naugatuck||CTTransit Waterbury: N1|
|Waterbury||87.5||Waterbury||CTTransit Waterbury: 40|
- Stratford (one AM inbound, one PM run outbound)
- In addition, one morning train continues to Stamford.
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. Also, except for Waterbury, all stations 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).
Rolling stock 
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 Budd RDC's and SPV-2000's. A typical shuttle consists of three cars.
See also