class 375?
Not a 375 - class 390 has been the closest guess so far.
class 375?
Class 395?
Not a 395 but we are now moving in the right direction again.
Final guess in the '3' series - Class 399?
Class 397?
387?? I completely forgot they were a thing
Does it even begin with 3?
not giving too many clues...
I'll try 444 then
Class 450?
Class 221?