The folding Inter thing disappeared almost as soon as it began. The very first batch had the locking pins on the inside of the front bulkhead , they disengaged by means of a central lever with connecting rods. I think one of the problems was the little sheet metal axle covers which had to swivel with the axles as they folded, not an ideal system. The next batch was like your old car Al. It had the ability to fold if you undone the two nuts where the pins were on the earlier cars. Next the late cars that just had one square box section axle. These were all hydraulic brake cars. So, in a sense the folding Inter is almost mythical. My green car is chassis number 15 and I'm not sure if that means the fifteenth car or the fifth with a one in front, was originally a folder, the stud that the disengage lever was attached to is still there. I ended up rebuilding the car as a non folder because I wanted the hydraulic brakes on this one. basically the car was a pile of spare parts thrown into a body shell and the pedal box that came with it was the later type with a master cylinder attached so I went with that as I didn't much like the cable brakes on my previous car
There you have it a potted history of folding/nonfolding Inters!.
