Time Capsules - Old Photographs from the past

A class of locomotive that represents Battle of Britain Squadrons, personalities and famous RAF Fighter Stations. She also represents the only VC ever awarded to an RAF Fighter Squadron, F/Lt. James Brindley Nicolson VC, and a Squadron that gained the reputation for being the highest scoring Squadron throughout WW2. If my information is correct she is now the only B.O.B. class loco to be in Barry condition. Surely there is someone out there who can save her for preservation.

I have a Friend, a B-o-B pilot from 74 sqn, He has a great interest in trains.
I wonder if you can help me? He wants to know why the Pacific Class loco has 2 funnells, and why the MALLARD (a relatively modern loco) has oil lamps at the front.

From Wikipedia:
The aim of blastpipe modification is to obtain maximum smokebox vacuum with minimum back pressure on the pistons. The simplest modification is a double chimney with twin blastpipes, but many other arrangements have been tried. Towards the end of the steam era the Kylchap exhaust was popular and used on the Nigel Gresley's Mallard. Other designs include Giesl, Lemaître and Lempor blastpipes.
Regarding oil lamps, most locomotives had no provision for electric lamps, although Bulleid Pacifics like this one did have an electric generator and lighting system.

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