The smaller brother

These 2 guys are the smaller bothers of the P2's that I have previously submitted and the A4's (Mallard World record fastest steam loco). They are much forgotten, B15/5 class, there were only 2 and they were re-developed, as test vehicles, from a much bigger class which will be coming to the platform one day in the future. The difference above is in the main to the side valances, which were removed as part of the war effort.