Probably used for backup moves while switching. Many roads have a few for that purpose. ...
First, if it's an BNSF hack in ex-Q territory, it's a "way car", in the same way locomotives are called "motors". With that over with...
Yes. They call 'em "shoving platforms", Some roads weld the doors shut, I guess to make absolutely sure there's no joyriding, attempts to use the decommissioned toilet, or whatever. The BNSF switch job in our area has the same arrangement. With roughly a five mile backup move to switch industries at the opposite end of town from the yard, crewman stands on the rear platform with radio in hand.
Notice that by some miracle it has no graffiti! Ours doesn't either.
Cannot say the same for their brethren in more urban locales.