The London and North Western Railway (LNWR) 7 ft 6 in Single 2-2-2 class was a type of express passenger locomotive designed by John Ramsbottom. They incorporated all the usual Ramsbottom features: his design of chimney top, safety valves and screw reverser, horizontal smoke box door, no cab, no brakes on the engine and no top lamp socket. The class is better known as the Problem class for the first locomotive built, but the most famous engine in the class was No 531 Lady of the Lake, since it was awarded a bronze medal at the International Exhibition in 1862. Its name came to be used colloquially as the class name. The first examples were built shortly after the acquisition of the Chester and Holyhead Railway by the LNWR and saw use on the Irish Mail route from London to Holyhead. They were the first locomotives fitted with water scoops, which could refill the tender from water troughs between the tracks without stopping. One such locomotive, No. 229 Watt, was the first to use them in non-stop run from Holyhead to Stafford in 1862, while conveying despatches relating to the Trent Affair (a diplomatic incident between the US and Britain in 1861). [Engraved for The Railway Engineer by C. Trent].