Hi Andrew,
Glad your up and running.
The track I have been showing pictures of does use fully modelled sleepers. It's not a documented feature, but a bit of a fiddle. You will need to read doc 4.06, procedural lofted geometry, which explains how to use the middle population geometry option to add a 3d modelled shape regularly along a loft (in this case the track). You only need to make one sleeper and this is automatically placed along the track. The one problem at the moment is that points have to use the standard flat painted sleepers. I'm hoping that this won't look too bad.
Just out of interest, this is a picture of the track in canvas :-
The trackbed and rails, sleeper, buffer and point lever are all separate parts and exported separately. It was just convenient to model them together in one scene.
Cheers,
Kevin