PICTURE: The Sir Nigel Gresley, which holds the British post-war steam speed record of 112mph, and sister locomotive to the famous Mallard.

and for moderating the speed in the descent of goods trains on gradients of 1 in 260. Indeed, the injection of steam alone has been effectually applied to light trains on a short incline of 1 in 22.

To demonstrate that the technology was fit for purpose and to select between the various competing options, on April 25, 1829 ...

The iconic Flying Scotsman steam train first entered service ... service in 1928 and became the UK's first locomotive to officially reach a speed of 100mph six years later. Considered the world's ...