This handsome side tank engine was one of a class used by a variety of Midland power stations. No 7151 was ordered by the City of Birmingham Electricity Supply for use at their Hams Hall Power Station, where it spent the whole of its working life. The order was placed with Robert Stephenson and Hawthorn Company on the 31st May 1943, with their standard 18inch diameter cylindered side tank design being chosen to be built. This design was chosen for its large size and power which was to be used to haul 1000 ton coal trains.

7151 was then built over the next 19 months in Forth Bank, Newcastle. This works was previously the main works of Hawthorn Leslie Company which had merged with Robert Stephenson and Company Ltd in 1937 to form, Robert Stephenson and Hawthorns (RSH) Limited. 7151 was finally outshopped from the works on the  11th December 1944 and sent to Hams Hall. 7151 was purchased by a Trust member from Hams Hall Power Station (CEGB) in the early 1980s.

The engine was moved to Bitton in 1980 and, following minor repairs and fitting of vacuum brake and steam heat equipment, entered service on the Santa Special trains that year. It was used on a regular basis for a couple of years until coming up for its ten year boiler overhaul.

The extent of the overhaul was greater than first thought, including work on the wheels and motion. A new inner firebox was also required which cost several thousands of pounds to manufacture and fit. The engine finally returned to traffic in November 1999 after an extensive overhaul which included a new blastpipe and a significant amount of work on the engines motion.

The loco worked tirelessly on the railway until 2006 when she was taken out of traffic for some boiler work. She returned to traffic just in time for the end of season gala in 2007 and has been a regular performer on the railway ever since until the boiler ticket ran out in 2014.