Pipe dimensions for 6121 car

What were the dimensions for the pipe carried by the Lionel 6121 pipe car? It appears they were 12" long, but what should the diameter be? Were the originals metal or plastic?

[#welcome]

Here is some information on what they were made of.

http://www.tandem-associates.com/lionel/lionel_trains_6121_flat_car.htm

You can try to get pipe from Jeff at The Train Tender

http://www.ttender.com/

Or Olsen’s

http://pictures.olsenstoy.com//default.htm

Hope this helps,

Kev.