Allll aboard Shy Guy's Perplex Express. It's a bit blockier than usual but there's plenty of sights to see. This faithful (with a few alterations) Minecraft recreation of the Perplex Express comes courtesy of Nathan_Oneday of WalschaertsBuilds. It's a scale recreation, under construction since early December. There's some secrets to find since, as the creator put it, he "couldn't resist hiding a ton of things around the train".
You can download the map here if you wanna explore the train yourself. If not, here are a couple shots I snapped ingame: