49 CFR §220.307

1. (a)General restriction. A railroad operating employee may use a railroad-supplied electronic device only for an authorized business purpose as specified by the railroad in writing. An authorized business purpose involving the taking of a photograph or video must be approved by FRA. A railroad subject to this subpart must submit to FRA's Associate Administrator for Railroad Safety/Chief Safety Officer a document specifying in writing the authorized business purpose(s) involving the taking of a photograph or video for which a railroad-supplied electronic device may be used by the carrier's railroad operating employees.
2. (b)Use by locomotive engineers operating controls. A locomotive engineer operating the controls of a train shall not use a railroad-supplied electronic device—
   1. (1)When on a moving train;
   2. (2)When any member of the crew is—
      1. (i)On the ground, or
      2. (ii)Riding rolling equipment during a switching operation; or
   3. (3)When any railroad employee is assisting in preparation of the train for movement.
3. (c)Use in freight and passenger locomotive cabs generally. In addition to the restrictions on locomotive engineers described in paragraph (b) of this section, a railroad operating employee who is not in deadhead status shall not use a railroad-supplied electronic device in the cab of a controlling locomotive unless—
   1. (1)A safety briefing that includes all crewmembers is held; and
   2. (2)All crewmembers agree that it is safe to use the device.
4. (d)Use outside freight locomotive cabs. A freight train crewmember who is not in deadhead status may use a railroad-supplied electronic device outside the cab of a controlling freight locomotive only if all of the following conditions are met:
   1. (1)The crewmember is not fouling a track; and
   2. (2)All crewmembers agree it is safe to use the device.