The service mode of SKA doesn’t support the BR 182 and 155 as substituting loco for freight trains. Even HMA which came after SKA supports them so was there only a small mistake made in the creation of SKA‘s service mode?
I believe it was an error missing them off the substitution list and Matt said when it was first noted that it would be fixed. So far there is no fix. It may be another six months or more before Adam’s team get round to working on SKA so maybe it will be fixed then. Such a long wait.
Seein how they're grouping patches, it may be possible that this will be fixed alongside the Br 187 release. For now, we don't know when it'll be fixed. I agree on the long wait though, I've run barely any freight services for SKA since I'd much prefer tackling them in a 155 over a 185. Edit: I wrote 182 instead of 185