R1-9 changing letters

Dont know if this question was asked before its it possible to change the route Letters in train simulator
examples the defaults is the Letter A when you change to Any other B F D E it convert back A even when I do it in edit or create a route
all help as always is appreciated:wave:

What exactly do you mean by “Route letters”? Are you on about the two letters that appear in the menu when selecting a route? Which in that case correspond to the “region” your route is set to? Or to a signalling system. Such as UK Theatre Indicator signals?

No, he's talking about route letters on subway trains.

sorry let me be more clear nycta route have letters and numbers for example 8th ave route letters are A E C 6th ave B D F bmt N R Q W J M Z IRT 1-7 hopefully this explains what im trying to do
sorry for any confusion