The 1800–85 series of stainless steel–bodied cars was built in 1993–94 by Bombardier from components manufactured in Canada and assembled in Barre, Vermont. (
This is known as the "No.
3" fleet.)
These cars seat 50, and 86 cars are in active service.
 An automated stop announcement system provides station announcements synchronized with visual announcements in red LED signs ceiling-mounted in each car.
These cars are stainless steel with red trim, and use yellow 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 AC traction motors with solid state controls manufactured by General Electric, very similar to the Breda A650 and Washington Metro 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.
As of 2018, both Big Red cars have been retrofitted with seats, about half as many as the standard 01800 series cars.
The 1800–85 series of stainless steel–bodied cars was built in 1993–94 by Bombardier from components manufactured in Canada and assembled in Barre, Vermont. (This is known as the "No. 3" fleet.) These cars seat 50, and 86 cars are in active service.  An automated stop announcement system provides station announcements synchronized with visual announcements in red LED signs ceiling-mounted in each car. These cars are stainless steel with red trim, and use yellow 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 AC traction motors with solid state controls manufactured by General Electric, very similar to the Breda A650 and Washington Metro 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. As of 2018, both Big Red cars have been retrofitted with seats, about half as many as the standard 01800 series cars.
Red Line (MBTA)