That’s the trouble with terminology today - it has to be gobbledegook to “impress”.
Back in the day, when the English language was used on the railway, you had brake standards, open composites, side corridor seconds, corridor thirds, six wheel lavatory firsts, and the like. Obvious.
Now, it has to DBSO-2F, BSK(II), SGHT MK 2-SO(T) and the like……
No doubt when the De Deitrichs and Mk 4s go, we’ll be faced with an array of identikit vehicles, but called “A”DFGH-1, “B2”-EV, SSD5 and so on.
Rant over.