I wonder why people don't bother putting the correct Head Lamps or Head code on UK trains? Even DTG seems to think the lamps or numbers are there for fun This was a bad example https://store.steampowered.com/app/222583/Train_Simulator_BR_Class_31_Loco_AddOn/ Peter
I don't think the UK headcodes are changeable on DTG stock. In my case I know about the lamp status, but I haven't a clue how the headcodes worked.
Here's some info on headcodes. https://en.wikipedia.org/wiki/Train_reporting_number#1960_headcode.2Freporting_number_merger
If it is a loco that displays Lamps there is usually a way of changing them in the - the class 76 has a separate switch for each lamp For a loco that shows a Headcode like the 31 go in to the Scenario Editor, double click on the loco number and a pop-up box appears giving you the option to change the number and/or headcode This picture shows the Headcode as in the official picture above I have double clicked on the loco number and this box on the right appeared - it shows 55217216 Loco number/Heacode I have changed the number and headcode Click F2 to save or push the play button and your loco now shows the numbers you have given it Peter