The only unit out on network is 810001.Thanks , In general though is there a specific way you keep track or is it just a case of knowing where it is currently and checking if it's moving on a given day?
All other units remain at factory under going static testing.
Regards 001, it can operate at any time on the Dalby Test, that won’t show up on any websites.
If you see Old Dalby to Peterborough, and then Peterborough to Newark 5Qxx paths on real time trains then, 99% it will be 810001.