Crossbucks, lights and wire
Details are where the fun is. One of the things Jen and I have been discussing about a putative model railroad is little animated detailed bits — crossings, traffic lights and so forth. Chances are, we’ll have to go shopping at Berkshire Junction at some point: they do crossbucks (in Z scale!) and other bits of lighting trickery, as well as some elastic telephone lines which is supposedly better than stringing thread from pole to pole.