Ok lots of suggestions flying around, lets narrow this down.
We are looking for:
1. A 100mph line preferably, these are quite heavy for the track on a 50-75mph route and lose the speed advantage.
2. Hilly preferably, these have a lot of power and their currently running with only two of three engines in use most of the time (Due to lower RA or less power needed).
2. Medium passenger loadings, we have three carriages to fill or running in 6 car formation.
4. Long distance between stops, these have intercity door spacings rather than suburban door spacings.
5. Somewhere they could be used in significant numbers, theres 51 trainsets spreading them around too much would lead to microfleet issues.