Here's the craziness going on the desert, replaced the final few axles today. All the rock are getting a refurbishment, which means replacing glue joints and lubricating rods and such. I've also ordered some reed switches and a relay to got with them, so I'll be experimenting with that. I've got a circuit that looks like it'll work so when I draw it up, I'll post it (and maybe even animate it!). At some point I should be back where I was before the fiasco with the mechanical issues and the grade issues started.