Postwar Lionel O Gauge No. 50 gang car with U shaped bumper mounts and side horn variations missing a worker mounting nib, no missing levers.  No. 65 hand car missing workers and cracked body with melting.  No. 50 gang car with L shaped bumper mounts and side horn variations missing two worker mounting nibs and levers.  Trains look C5-6.  One gang car has an original bumper that is made of an uncolored rubber.  It is exactly the same size as a "blue" bumper, but is thicker walled.  Possible prototype?