If I can figure it out ill try and make a colorable version :/

Like I said: the coloring is enabled via the cblend file. If it's in a greenish, it's colorable, if it's in an orange tone, it's not. Normally, the red stripes on the 4024 are in the greenish tone, so they should be colorable. However, this is not the case at the moment.
BUT this mod links directly to the original 4024 from the Vienna Fever package, so everything that relates to this, is not in my hands.

I forgot how to make things colorable I believe there was a a color that acts as multi use color in the texture files (I wouldn't know). 4024 would look nice in multiple color schemes.

So I took a look into it. For the coloring needed files are linked with the ones drom the original mod and the textures are looking fine. However, even the original 4024 can't be colored currently. Maybe there's a conflict with the new update, but I can't say for sure.

But the salient point is, from my side everything seems correct.

Maybe it is how I have the mod installed. (Transit network colors is Seagreen and Purple). I normally assign fleets by the line color.

The Talent (ÖBB 4024) should be colorable

Think you can make a multi colorable version for fantasy lines?