While I can put red markers on the back of the Flying Scotsman, I have to wonder on how to put them on the top and bottom? Please and thank you
The code was probably copied from the LMS Jubilee which does have four places for lamps, but the top and bottom one may have been removed from the Scotsman
As MJCKP said, probably reused UI from the Jubilee. The Scotsman's Tender Corridor probably obstructs any mounting location for lamps.
I think that's where the tail lamp is supposed to go anyway, as can be seen on this screenshot the light is where the tail lamp sits.