Needed an N Scale Conrail bay window caboose and found one on eBay but it had the rapido trucks and couplers and to make it worse the hole was to big just to drop a pin in and add Atlas trucks. So I decided to just add couplers and trucks separate which I never done before. So I got the couplers just needed to screw in a hole, that was easier said then done. So I got my soldering gun and made a hole and they slid right in and fit. Now the tricky part was finding trucks that would fit. I tried using Atlas and
and it was a no go. So I added some very thin washers to help and found some Micro Trains trucks and low and behold, they fit and work great.