Having decided to skip the Durango & Silverton Narrow Gauge Railroad on the basis that it's 8 hour roundtrip was about 7 hours too long for a toddler, we decided to try the Georgetown Loop Railroad. Their trip is just over an hour, and it was only 30 minutes from Keystone. It rained just a tiny bit, and was the only time on the trip we broke out the sweatshirts.