Chi town Steve, Thanks for posting a picture of #9783 Baltimore and Ohio box car. Like you, this car was always one of my favorites.
Robert S Butler, Thank you for posting pictures of your Penn Central GG-1 and freight cars. MPC also made a #9300 Penn Central log dump car and a number #8576 Penn Central GP-7 diesel.
Doug, The #9212 was a LCCA Seaboard flat car with trailers.
The MPC #9213 is Minneapolis and St Louis red hopper. It came in the 1978 Lionel Service Station set.
Boomer0622, Thank you, for posting pictures of (15) of your MPC freight cars. Sure do make a colorful display. Also, the two cars you asked about I would hunt them. Both will show up.