Hi Bob,
Thanks for the reply. It was a visible bar or spacer I was looking for, but have since discovered my idea won't work anyway. What I wanted to do was place a short towbar between a tug and an ore barge but the problem is the bar I have found now (logging skeleton to loco in the set of logging bogeys) is set above the rail and the ore barge and tug are below the rail.
Thanks again,
Cheers,
Bill