How do I safely remove the shell of a postwar Flyer freight car?

Do you have any suggestions for easily and safely removing the pins that hold the plastic body shell on various American Flyer freight and passenger cars from the postwar era? Using a pair of pliers has not worked. — Robert Lawrence

You have to wedge a screwdriver or another tool between the body shell and the floor and then try to gently pry them apart. You may have to move back and forth between positions while carefully easing them out a little at a time.