"Pretend we actually know what we're doing for an instant," Stiles says sardonically. Tracing the different routes the trains take is a slow process, and the whole thing reminds him that this isn't the first time he's gone over a map like this.

"Okay." Stiles studies the train Derek picked out, noting little circled number on the route, seventeen - that's what they're looking for. "Now we just need to find it."

Find the platform, find the train.

Easy, right?