At a first sight you might be tempted to believe this is entirely fake, but the Smart forfour was actually converted into the smallest train in the entire world. Responsible for this spectacular transformation is Interfleet, a company based in United Kingdom, which completed the job in six months. During this interval there were a lot engineering tasks to accomplish, as well as many hours of CAD modeling to make sure everything is ready for testing.
The standard alloy wheels of the Smart forfour were obviously removed and instead it gained large 22-inch wheels made from solid steel, with each tipping the scales at 80 kg. While Interfleet usually works on those massive diesel locomotives with 16-liter engines and weighing 70 tons, this time they had to adapt a 1.0-liter, 1 ton city car for the rails.
One of the most important modifications was disabling the car’s steering and they also locked the wheels by welding aluminum supports between the front and rear axles. Needless to say, this was necessary because any movement of the front wheels would have caused the car to drive off the rails and crash.
After development was completed, the Smart forrail was actually tested on a private railway measuring 16 km. The testing procedures were conducted under direct supervision on the Bluebell Railway that goes through Surrey, UK and is owned by a private company. A few people participating at a railway exhibition were actually transported in the custom forfour and reached their desired destination without any incidents whatsoever.
According to Smart, the main objective was to create “arguably the most efficient, and fun, commuting machine in the world.” After the testing procedures came to an end, the Smart forfour was reverted back to its original configuration so it replaced the rails with the city tarmac.