The model is Methylated Spirit fired with electronic low water alarm. LBSC designed it to be coal fired too, but the grate is tiny & I suspect you would need coal dust!
More detail has been added to make it a beter representation of a Southern Railway 'Schools' class.
Working pressure 60psi & It runs very nicely. LBSC's drawings, words & music are still available from TEE Publishing.
For more information regarding its restoration, visit www.jsbmodelrestorations.com/?...
Video is from 2010.