What is required for a locomotive to be left unattended on a main track?

The requirement for a locomotive to be left unattended on a main track is fundamentally based on safety protocols that ensure the train does not pose a hazard to other trains or personnel. Leaving a locomotive unattended on a main track is generally prohibited because it creates risks of accidental movement and potential collisions. This practice is intended to maintain operational safety by preventing unattended locomotives from being in a position where they could roll away or interfere with the operations of other trains.

In situations where it is absolutely necessary to leave a locomotive on the main track, there are stringent guidelines in place that dictate how it should be secured. These include the use of hand brakes or having qualified personnel present to manage the locomotive, ensuring that it cannot move unexpectedly. Therefore, the standard practice is to refrain from leaving locomotives unattended on main tracks, highlighting the importance of maintaining a safe operating environment in rail operations.