A pair of CPR 40' woodchip cars, rebuilt from old 40' boxcars. The one at left still needs hinge and latch details finished up on the doors, while the extended height car at right hasn't had the doors started yet.
The extended height car is an example of an 8' door PS-1 car rebuilt for the International of Maine division. Originally they kept their original numbers and were simply noted in equipment registers, but were later renumbered and thrown in with the rest of the 40' cars that were being converted in the late 1970s without the tall sides. These cars simply had the roofs torched away, leaving some of the roof ribs behind as cross braces. They converted a lot of 50' cars in the early '90s, but that's a little new for my early '80s timeframe.
Both these cars are Intermountain 40' PS-1 boxcars. 6' door on the left car, 8' on the right.
I've got one more of the 8' door extended height cars in progress, and I'm looking for good candidate models for more of the later quick and dirty jobs. The intermountain PS-1s are nice to work with, but International of Maine PS-1s would have been in the minority of the 6' door cars converted.
I'll be looking at using one of the scratchbuilt doors to make a master for a mold and cast copies in order to build up multiple cars quickly. With a casting for the door, the non-extended height cars will knock together in about 5-10 minutes.
Prototype example:
http://freight.railfan.ca/cprail/cp31403.jpg