I know the emergency phones are there. I've seen them hundreds of times. I've seen them so often in fact, they've basically become "wallpaper." I don't even think about or notice them anymore.
I'm not sure I would have even thought about the phones in this case... If this was a situation that was more of an immediate emergency, one that absolutely required a stop, then sure, I'd probably think, "Hey! We can contact the driver using the phone!"
But in this case, thinking "Wow, we better tell a cast member once we get to the station!" seems like a perfectly reasonable response given the circumstances.