By whom the rear portion of train left behind in block section protected? A. By Guard B. By LP C. By engineearing official D. No need to protect the load

The correct answer is: A. By Guard.

The guard is responsible for protecting the rear portion of a train left behind in a block section. This is done by placing a red flag or lantern on the rear of the train and by ensuring that the train is properly secured.

The LP (Locomotive Pilot) is responsible for operating the locomotive and for ensuring that the train is moving safely. The engineering official is responsible for the overall safety of the train and for ensuring that the train is in good condition. There is no need to protect the load if the train is properly secured.