The MTA has some interesting new ideas for letting customers know about service changes. On several recent mornings over the last few months, I have gone to the downtown platform on the 4 train at Fordham Road on the Bronx and waited patiently with about 20 to 50 other people, watching trains go by in the other direction, until a train came going my way, but on the middle utility set of tracks. The conductor was leaning out the window as it went by, and I could see him shouting something at us, but since he didn't shout when he was right in front of me, I couldn't hear him at all above the train's noise. But by following the crowd I gathered that we were being told to go to the uptown platform, take it 3 or 4 stops, and get a downtown train there. No signs or anything, no warning from the token booth clerks, just an apparently spontaneous decision to do some track work or something.