Saturday, January 20, 2018

AHM trolley couplers

If you saw the video in the previous post you'll have seen the segment where the old AHM trolley and trailer got stuck in the Neville Park Loop. The curves have a 7" radius - which is ok for single-car operations with the fleet - but cause a problem when the trolley is pulling a trailer. I think the problem is with the coupler - which is just a short metal bar that pivots on posts moulded on each trolley. The bar isn't right for such tight radius track. I need to replace it with something that has more free-play so the trucks aren't forced into odd angles against the rail during turns. An interesting problem.


  1. Some new steam locos come with an expanding link between the engine and the tender. Something that tightens up when straight, loosens when it goes into curves. That would solve things, no?

    1. That sounds like a good idea. I'll have to dig in and see what I can find. I was also thinking about a loop of thread, but it would not be prototypical and as you point out, it would not be tight and provide a proper link on a straight section of track.