Built by the US Army in the 1950s, this colossus was designed to transport cargo in the arctic — operating like a train, but without tracks. It was used successfully for over a decade (for the last time in 1962), but was eventually made obsolete by the development of helicopters. Read more about it at Diseno-Art.com.
The Saluda Grade is the steepest section of railroad in the USA. There have been numerous horrific tragedies involving runaway trains here. But this propaganda-cum-safety video from Southern Railway makes the whole affair seem a candidate for our boredom contest.
Imagine you're riding in a train, when you see another train hurtling toward you on the same track. No problem. You're on the "anti-collision train," designed by P.K. Stern of New York. It was a bold idea for improving travel safety, but it never caught on. The Strand magazine (1904) explained the concept:
A single track is used, on which railway-cars are caused to travel. Two cars are rushing towards each other at a speed of twenty-five miles an hour, so that a collision would, under ordinary conditions, be inevitable, when suddenly one of the cars runs, not into, but over the top of the other and lands on the track on the other side, where it continues in perfect safety to its destination. The underneath car has proceeded as if nothing had happened.
The cars, although they run upon wheels, are really travelling bridges, with overhanging compartments for the accommodation of passengers. Over the framed structure of the cars thus constituted an arched track is carried, securely fastened to the car and serving the purpose of providing a road-bed for the colliding car. This superimposed track is built in accordance with well-understood principles of bridge construction.