Train Drama

So I get down to the LIRR area of Penn Station tonight to find that there are even more swarming masses than usual (never a good sign). Announcements are being made to not descend to the train platforms until your train is announced (most commuter trains typically use the same track each day and so, if you're used to a certain train, you can bypass all the Penn Station craziness by going directly to the track where you expect to grab your train). The announcement then goes on to state that some trains are being canceled and/or combined due to "equipment shortages". Equipment shortages? What? Did some trains go missing or something?