Sue,
If you will be traveling from Córdoba to Ronda ( info from your previous post),
You will be traveling via AVE ( high speed train) from Córdoba to Antequera Santa Ana where you'll transfer to an MD ( medium distance) train which will take you to Ronda. There is no bus involved when traveling from Antequera Santa Ana to Ronda.
The icon with the red ! explains that passengers will be transported by bus if traveling from Antequera Santa Ana to Antequera City, Loja or Granada. I understand how this would be confusing.
Since the railways are undergoing renovations between Antequera Santa Ana & Granada, passengers traveling on this route are transported via bus( provided by Renfe) from Granada to Antequera Santa Ana or vice- versa.
Bottom line, since your route does not involve going to Granada, you will not be traveling by bus from Antequera Santa Ana to Ronda; you will be traveling by MD train.
Enjoy your trip!