(b) When conducting a test or inspection under part 217 of this chapter, a railroad officer, manager, or supervisor is prohibited from calling the personal electronic device or the railroad-supplied electronic device used by a railroad operating employee while the railroad officer, manager, or supervisor knows or should have known that—

1. (1) The train to which the employee is assigned is moving;

2. (2) The employee is—

   1. (i) On the ground;
   2. (ii) Riding rolling equipment during switching operations; or
   3. (iii) Assisting in preparation of the train to which the employee is assigned for movement.