since the late 1990s and early 2000s, the mta has experimented with automatic train operation. new york city subway trains normally run with a train conductor and a train engineer. in 2006, the l train was the first route to be run by computers. the 7 train is becoming the second route to be run by a computer. there are computers both on the train and along the side of the tracks. the computer does the engineer's job by driving and stopping the train.