June 22nd, 2016. After a year of restoration, Southern Pacific 4460 was once again steamed up and returned to the rails. She was on her way to Wishram, Washington to meet up with sister engine 4449. The rail fans scattered all along the mainline awaiting her for runby. 4460 was quickly approaching a blind curve ahead and straight into a tunnel. Strangely, the tunnel was glowing with multicolored flames. By then it was too late. She disappeared in the flaming portal. 4460 gets an interesting greeting from Ponyville when it's lassoed to a stop by Braeburn and a few others. Twilight Sparkle wondered if 4460 was one of the earlier and only pieces of human technology that exists in Equestria. She has Spike report 4460's arrival to Princess Celestia. Little did they know that Celestia had a secret connection to human innovation, including the locomotive. She relies on the Mane 6, a human, and some others, to drive the 4460 through the secret portal along a abandoned magic railroad that can connect to both worlds.