I think the Network rail class 73/9 test train would be a good loco addon. The class 73 was built in 1965. Max speed: 90mph (145kmh). Power: 1,600hp. The coaches used are fitted with on board computers and lasers to analyse the track’s geometry, clearance between lineside objects, and cants on curves for any anomalies or defects. Staff on board the test train analyse the data recorded and can identify areas where potential problems might occur in future. The class 73 would have 2 liverys: GBRailfreight livery: Network Rail livery:
Unfortunately 73138 no longer works test trains but I was able to see it quite a few times having lived in the area when 73/1s were common on test trains . Would be nice to see but I think inside the coaching stock will be a bit hard to model
