They are long enough for an eight-car train.
For now, only the two eight-car trains on the L line are being supervised by computers.
The station was about 165 metres long and could accommodate an eight-car suburban train.
Two units were intended to be coupled together, forming an eight-car train.
These normally ran in 3-car formation, but eight-car trains were seen.
Each car has its own motor, and an eight-car train could run safely even if motors in two or three cars go dead.
The car was dragged nearly a quarter mile before the eight-car train came to a stop, he said.
The first task was to get the eight-car train off the tracks.
"The operator finds the dog underneath the seventh car of his eight-car train."
All stations are able to accommodate eight-car trains, but this length is not yet used.