Since the picture is about the engines I chose not to include any background or foreground and, in my opinion, the wide, narrow format makes the images look more dramatic than they would have done individually and the backward sweeping smoke provides a sense of movement.
For any rail enthusiasts, the engine on the left is "6100 Royal Scot", the first of the 4-6-0 Royal Scot Class express passenger locomotives. Introduced in 1927, like many engines it has experienced many upgrades and rebuilds, and this is how it looked in the mid-1950's. The class was withdrawn from service in the early 1960's. The engine on the right is "4468 Mallard", a Class A4 4-6-2 Pacific steam locomotive. Built in 1938, Mallard holds the world speed record for steam locomotives of 125.88 mph. It was withdrawn in 1963 after almost 1.5 million miles of service. Mallard went through several redesigns and liveries which saw it with streamlined 'skirts' over it's wheels, twin tenders and double funnels. It is currently on display at the National Railway Museum in York.