Here's a link to Resolution SX-88 adopted by the CPUC on 9/18 regarding the in-cab use of personal electronic devices, i.e., cell phones:
[
docs.cpuc.ca.gov]
The pertinent part reads:
"Therefore IT IS ORDERED that:
1. Personal use of commercial mobile radio services and devices by on-duty railroad engineers, brakemen, conductors, or rail transit vehicle operators is prohibited except for personal communications which take place when the train or transit vehicle is stopped and with the approval of the appropriate management personnel."