I love seeing old ideas for things that never got beyond the prototype stage. That’s particularly true from the early age of mechanisation – crazy ideas like steam cars or balloon ships look more like steampunk fiction than reality. Take this steam tractor, built by LEGO builder Nikolaus Löwe. Nikolaus is no stranger to sci-fi creations, and indeed that’s what I figured this was. It looks very functional, and yet like nothing I’ve ever really seen… And yet, it was real! This is a model of an early Hornsby steam tractor, of which only one was ever made. The model itself was not a commercial success, by all accounts, but early prototypes did result in the tracks being dubbed ‘caterpillar’ tracks on account of their caterpillar-like motion. Indeed, the Hornsby firm would eventually morph into the company we know as Caterpillar today.

Oh, and speaking of motion – see all those functional-looking gears and Technic axles? They’re not just for show, you know! There’s a great video showing off all the tractor’s functions, including an impressive differential steering mechanism – check it out!