Editing Red Line (MBTA) (section)

===Stainless steel–bodied cars===
[[File:MBTA Red Line Bombardier Charles MGH Station (51976063347) (cropped).jpg|thumb|right|A train of 1800-series cars on the Longfellow Bridge]]
The 1800–85 series of [[stainless steel]]–bodied cars was built in 1993–94 by [[Bombardier Transportation|Bombardier]] from components manufactured in [[Canada]] and assembled in [[Barre, Vermont (city)|Barre, Vermont]]. (This is known as the "No. 3" fleet.) These cars seat 50, and all 86 cars are in active service.  An automated stop announcement system provides station announcements synchronized with visual announcements in red [[light-emitting diode|LED]] signs ceiling-mounted in each car. These cars are stainless steel with red trim, and use yellow [[Liquid crystal display|LCD]] exterior signs. These cars originally had red cloth seats (in contrast to the black leather seats of other cars), but in the early 21st century the cloth seats were replaced with black leather seats. More recently the black leather seats were replaced with vandalism-proof reinforced carpet type seats containing multi-colored patterns, as with the other Red Line stock.

They have modern [[Alternating current|AC]] traction motors with [[solid state (electronics)|solid state]] controls manufactured by [[General Electric]], very similar to the [[Breda A650]] for the [[Los Angeles Metro Rail]], the [[R110B (New York City Subway car)|Bombardier R110B]] prototype for the [[New York City Subway]], and the [[Washington Metro]] [[Washington Metro rolling stock#1000-series|1000 series]]. They can operate only as mated pairs and can partially interoperate with older cars in emergencies or non-revenue equipment moves, but not in revenue service.

In December 2008, the MBTA began running a pair of modified 1800 series cars without seats, in order to increase train capacity. The MBTA became the first transit operator in the United States with heavy rail operations to run cars modified for this purpose. These cars, set 1802–1803, have been designated as "Big Red" cars, denoted by large stickers adjacent to the doors. Automated service announcements at stations alert passengers to the arrival of these high-capacity trains.<ref>[http://www.wickedlocal.com/cambridge/news/x1720679869/MBTA-introduces-new-high-capacity-cars MBTA strips out the seats from some Red Line trains] {{webarchive|url=https://web.archive.org/web/20121108010518/http://www.wickedlocal.com/cambridge/news/x1720679869/MBTA-introduces-new-high-capacity-cars |date=2012-11-08 }}</ref> As of 2018, both Big Red cars have been retrofitted with seats, about half as many as the standard 01800 series cars.

Cars 01816 and 01817, out of service since 2004, were donated to the US Coast Guard in November 2021. They were relocated to [[Otis Air Force Base]] for training use.<ref name=roster2022>{{cite magazine |magazine=Rollsign |publisher=[[Boston Street Railway Association]] |date=January–February 2022 |issue=1–2 |volume=59 |title=MBTA Vehicle Inventory as of February 28, 2022 |first=Jonathan |last=Belcher |page=6}}</ref>