I’m pretty sure he had no idea they had been sitting rusted for years. In Grayson’s imagination he was chugging down the tracks on a grand adventure. He ran top speed from train to train forever pretending (with fairly accurate sound effects) to drive them all. Then much to the disappointment of a train obsessed preschooler, the man with the conductor’s hat (and the gold key on a great big ring) walked up and locked the gate. Best day ever, and I’m willing to bet he’s already begging to go back.