The name 'Great Western Railway' immediately conjures up images of Stars, Castles and Kings, the legendary express passenger locomotives that were the envy of the world in their day. However, the Swindon empire also produced extensive fleets of all-purpose tank engines - everyday reliable workhorses and unsung heroes - which were also standout classics in their own right. The most distinctive and immediately recognizable type in terms of shape, all but unique to the GWR, was the six-coupled pannier tank.