This is a present for Jake. (Thanks, BoingBoing.)
The rest of you can share in the bounty.
I could have just sent it straight to Jake, but he hasn't made an appearance here in a while and I like to give him the spotlight.
Jake, by the way, builds amazing bicycles, although I do not believe he has built one that rides on railroad tracks. But he could if he wanted to, I'm sure. If he sent me photos of his bicycles, I would share them with you.