I have decided it is time my locos had a crew in the cab. Thing is how do you know what side of the cab the driver sat in the different types of loco. Was there a set format laid down somewhere, or was it left to the loco builders. Also did the crews all wear the same blue boilersuits, or was this something that varied between different companies.
You need to know if the loco was left or right hand drive. Some companies stuck rigorously to one or the other but a few had a mixture. Looking on the outside of the loco, if it has a reversing rod which is visible (not often on tanks) then that is the driver's side. In my time drivers did not wear boiler suits. Denim type jackets and serge trousers (you need something to catch the sparks) with oily caps. Almost always in a middle blue shade for the jacket and black for the trousers (but sometimes denim type trousers were seen).
The LMS standardised on LH drive for new locos but possessed a lot of RHD inherited from constituents. The LNER started off LHD and then changed and there are locos in the same class with different driving sides. Can I suggest you have a look at photos, preferably of your actual model loco if you can find one. If you can't see a reversing rod then it is a fair chance that it is on the other side. BR standards were all LHD.