Wow, you're really rushing things.... We must be patient.
The railcar itself is trucked by flatbed, the [bogies](truck in North American usage) is shipped separately to the depot (Pitkin yard in this case). When all equipment arrives, the [bogies] are set up on the rails, then the railcar is moved onto the bogies by crane, or whatever other method necessary. (I wouldn't know, since I'm not an MTA employee).
At least thats how I think it works....