> "as the new system only works on post-2000s trains." Actually, it isn't even all post-2000s trains. The CBTC [2] train controls aren't even on all of the po

> "as the new system only works on post-2000s trains." Actually, it isn't even all post-2000s trains. The CBTC [2] train controls aren't even on all of the post-2000s trains. In fact besides the 'L' train which has already been converted, only the 7 line has all of its cars as CBTC [1]. This is really bad news, because ideally, the very, very crowded 4,5,6 lines mentioned in the NYT article should be the lines to have the signals computerized, but the 4, 5 trains are relatively "new" having been put in service in 1999-2003 or so. Some of the trains in service are > 50 years old. [1] https://en.wikipedia.org/wiki/New_York_City_Subway_rolling_stock https://en.wikipedia.org/wiki/New_York_City_Subway_rolling_s... [2] https://en.wikipedia.org/wiki/Communications-based_train_control https://en.wikipedia.org/wiki/Communications-based_train_con...