Subway cars at Hunts Point

What's the story behind these cars? ://binged.it/2Bihe5v

For future viewers: Here is the link: https://binged.it/2Bihe5v It shows two redbirds on a very short, isolated elevated structure in the middle of a parking lot. It looks to be out back of the MTA Tiffany Iron Shop, 1170 Oak Point Ave.

That is the MTA Infrastructure Division.

http://forgotten-ny.com/2017/08/redbirds-hunts-point/" onclick="window.open(this.href);return false;

That's kind of an odd setup. Is it for firefighter training?

Might be for police training along with their "Emergency Service Units"(combo SWAT/RESCUE teams)
Also FDNY rescue training.
Might double as a TV/Movie set for stunts that the TA would not allow production companies to do on live tracks.