This discussion has appeared a few times over the years, (and similarly for Tyne Wear Metro on NR), but AFAICS the original question has never been answered. Threads always get into the TOPS class numbers used by these visitors - and the train reporting numbers (headcodes) used by the signalling system.
Now, AIUI for trains/units running on NR someone can query a train reporting number, and somehow between TRUST and TOPS or whatever database they can find out the unit number, loco number, carriages, freight consist etc etc.
But what do you actually get if querying an LU (or TWM) service? If we return to the first question, it was “are the units given TOPS numbers”. Let’s assume that really meant “are the units given individual TOPS numbers”.
I think we know most of these visiting units don't carry TOPS style 6 digit painted numbers - do they even exist? Do NR systems even need to know?