A. Nothing contained in sections 40-881 and 40-882 shall apply:
1. To relief or wrecking trains when a sufficient number of persons are not immediately available to comply with those sections.
2. To any railroad less than forty miles long, including all of its operated lines.
3. When trains have been sent out or started at the last division point with the requisite number of employees, but, owing solely to disability or refusal of one or more of the employees to act, the train is left with less than a full crew.
B. No baggage master shall be required in the operation of a train upon which baggage is not carried.