49 USC 21105 - Limitations on duty hours of dispatching service employees

(a) Application.— 
This section applies, rather than section 21103 or 21104 of this title, to a train employee or signal employee during any period of time the employee is performing duties of a dispatching service employee.
(b) General.— 
Except as provided in subsection (d) of this section, a dispatching service employee may not be required or allowed to remain or go on duty for more than
(1) a total of 9 hours during a 24-hour period in a tower, office, station, or place at which at least 2 shifts are employed; or
(2) a total of 12 hours during a 24-hour period in a tower, office, station, or place at which only one shift is employed.

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(c) Determining Time on Duty.— 
Under subsection (b) of this section, time spent performing any other service for the railroad carrier during a 24-hour period in which the employee is on duty in a tower, office, station, or other place is time on duty in that tower, office, station, or place.
(d) Emergencies.— 
When an emergency exists, a dispatching service employee may be allowed to remain or go on duty for not more than 4 additional hours during a period of 24 consecutive hours for not more than 3 days during a period of 7 consecutive days.