Maybe more then you think. The Old Dog remembers reading in trains that some RR’s use cell phones to control turnouts. Some RR’s may be using them for dispatching and other official business.
One has to also wonder if some crewmen may be using them for personal conversations.
Things being what they are, it is likily that cell phone use will be held partially responsible for a railroad wreck in the near future.
A couple days ago I was walking home from work when I spotted a girl in her car who had come to a stop behind a stop sign…and she was yacking away on her cell phone. She had her window rolled down and I told her to “Stuff that cell phone up your *** and pay attention to your driving!!”