There are lots of small improvements that could be made to this system. Passengers are often left in the dark about what is happening, and so can't make informed decisions about which train to take, or whether to take the train at all. Announcements are rare except when trains are to be rerouted. The overhead signs that report arrival time estimates and delays are not always visible from the turnstile. And on the Lexington Ave line local track, most of those signs do not show the express train times, so transferring from the local to the express is always a gamble.