Rail mount detail.
It was a little annoying that the main beams in the Walthers model are a bit narrow to gauge - ie. the rails do not sit over the centre of the beam, but are toward the outer edge. This spoils the effect a bit. I didn't notice this until the project was well advanced; if I had known it at the start I might have scratchbuilt the entire highline and just used parts from the kit that fit.