Surely it can’t be split into sub classes. A 150 is a 150 whether it is a /0, /1 or /2. A bit like a 47. Many sub classes but they are still 47’s.That is a good question considering that EMR services are frequently short formed. If they could get all the units out in service with the cuts to the service they wouldnt need them on the current timetable. But if EMR could operate their full timetable these units would be needed.
In answer to the question I would go for the 150/0 or 150/1
I’ll go with 318 on this or if 484 is allowed then I shall go with class 69. Isn’t the earliest one from 1976