Signal Error? Getting A "approach Medium" When It Should Be An "advance Approach"

I don't know for sure if this is the case with CSX so maybe I'm wrong here, but I'm pretty sure that the signal before an "Approach" (Yellow, Yellow over Red, Yellow over Red over Red) should be an Advance Approach, but in TSW I always get a "Approach Medium" (Yellow over Green or Yellow over Green over Red). Can anyone shed some light on this?

http://signals.jovet.net/rules/CSX Signal Rules.pdf

 

You are right. DTG can’t get anything right.

 

Thanks. Dovetail?

 

Signal progressions can vary.

Advance Approach > Approach > Stop is a common one

There are less common progressions like
Approach Limited > Approach > Stop

Approach Medium > Approach > Stop seems unlikely but may be possible