Hi Derrickman,
If it is the picture showing what is believed to be Hunslet "Lilian", the loco immrediately behind is "Sgt Murphy", built by Kerr Stuart. "Sgt Murphy" was heavily rebuilt at Penrhyn, but the basic original outline of the loco is still recognisable. "Sgt Murphy" is a "Haig" class loco, which is a follow-on from the Kerr Stuart "Joffre" type, which in turn is a copy a Decauville type developed for the French Army during the first world War, so well spotted.
The Hunslet is "Lilian", you can just read the name on the plate.
Cheers
Alan