In 1934 Sir Nigel Gresley and the London North Eastern Railway unveiled a new powerful express passenger locomotive for use in Scotland. This massive locomotive was named Cock o’ the North and was extensively trialled in the UK before further testing in France. The design was ahead of its time and this led to some problems that were never fully resolved, a factor in the decision to rebuild the locomotives as Pacifics during WW2. Now, that unfinished development work is being completed using 21st Century design and manufacturing technology. To be named Prince of Wales, the new P2 Class locomotive will operate across the UK and justify the claims that the original Gresley design was Britain’s most powerful passenger steam locomotive.