MTA NYC Subway Bombardier Transportation R179 cars 3060 & 3061 being trucked on Broadway (from the George Washington Bridge), en route to the 207th St Yard. This video was taken on April 5, 2017.
Well not necessarily, it’s because those cars have to be inspected before officially being put on New York lines, there are different tracks for different trains, and simply because trains are considered a vehicle meaning they have mileage as well and the MTA simply wanted to preserve as much of that to provide a ever lasting commuter train