Peter,
If this is a Mark III car, it would be good for NYC(PC), MARX, NIFX(leased to the Milw), SAL, SOU, & WP. I have no idea of what/where/who operated the MARX cars(cheap train sets!?).
Jim
Modeling BNSF and Milwaukee Road in SW Wisconsin
Back in, probably, 1962 or 3, I photographed the operation of loading a Flexivan at Mile End Goods yard, Adelaide.
I recently submitted these photographs to Catchpoint magazine and I believe that they have been published.
If you can access this magazine, the images may be of some interest.
When I say loading, mean transferring from the road vehicle onto the rail one.
ChuckAllen, TX