The "L" line (8th Ave & 14th St., Manhattan to Canarsie, Brooklyn) is the first in the NYC subway system proposed for fully-automated operation (i.e. no humans driving or opening/closing doors). While that's probably still years away, we now have signs in each station along this line displaying how long it will be for the next two trains to arrive. The 2 minute wait for the next train turned out to be accurate!