Shadow Partner

I rolled straight into a broad stripe of golden sunlight beaming down from the high stairwell window, and there was a giant engine running right beside me on the wall! The beam caught my blue boiler and threw a huge, crisp silhouette across the smooth gray concrete. I nudged my wheels forward an inch, and my dark partner copied the motion instantly, wheels spinning and funnel held high. I backed up two paces and put on a sudden burst of speed, watching my towering shadow match every click and clack against the painted wall. We were running a double-headed express run with perfect precision!