Molly is a yellow tender engine.
Molly is painted yellow with grey and red stripes and brass boiler bands.
Molly is a Great Eastern Railway D56 Claud Hamilton. Claud Hamiltons were built at Stratford Works from 1904 to 1911. Although Molly keeps the GER standard sized 7-foot driving wheels, she has a large 4' 9" boiler, Schmidt superheaters and a Belpaire firebox. Her cab is fitted with two side windows. She has a Great Northern-style chimney, a flat firegrate and a variable blastpipe.