Quick, turn the correct valve or the engine will blow up!
What could be more fun than a handcar? A little motorcycle handcar:
You can check out a few more photos here.
I think the most interesting thing we learned about was the signalling device known as the torpedo. If a train is stopped on the tracks, and you want to warn the next train coming down the line, you hike back a half mile or so and strap a small bomb to the tracks to get the engineer's attention.
For lunch, we stopped at Alfredo's, and the Yucatecan fare was excellent. We chatted for a bit with Maria about our travels in the Yucatan -- she and her husband hail from Mérida -- and the food was good and authentic. Here's my pollo pibil: