WHEN I JOINED THE MUSEUM in January of this year, one of the warnings passed along to me was “Don’t turn on the train! Just don’t touch it. We don’t know exactly what all is wrong, but it doesn’t work right, and might fall off the track.” Goodness. That made me want to touch the train! Maybe I could catch it if it falls, I thought. But I didn’t touch the train. Instead, I set out to find someone…