A Jolt Along the Rails

A sudden warm spark surged through my boiler! My eyes blinked wide open, taking in the rugged hills and the wooden shed ahead. I twitched my side rods, eager to see if they'd turn—and with a sudden clatter, my metal wheels rolled forward on the iron rail! I nudged a loose pebble resting on the track, sending it skittering off into the pale gravel with a crisp tap. I'm really moving, completely under my own steam, ready for whatever track lies ahead!