They still use it out here in Arizona.
I normally hear minimal traffic on it, but on two occasions I heard a lot more.
When UP844 arrived into the Cienega Creek Pass area, I was sitting off the Cienega Creek bridge watching from the other side of the bridge, and heard the helicopter that was flying along the track ahead of UP844 calling out positions of people located on the wrong side of the track to UP cops on the ground. I heard plenty more traffic when I actually moved further west and rejoined UP844 about 20 miles away and sped away with no less than six UP Cop vehicles all chatting about the traffic, and the crazy people chasing after a train and taking pictures outside their moving vehicles, et al. We, of course, were following alongside the train from Tucson to Phoenix on I-10. My own comment, they did not see very educated about what the excitement was all about UP844 !
On another occasion recently I heard them on this and a simplex frequency in the RR band, can't remember it though, sorry
They were conducting a surveillance operation.
It was CSQ. No tones whatsoever.