What is the required speed for a train after it has stopped at a block signal displaying a stop indication?

When a train stops at a block signal displaying a stop indication, it is required to proceed at restricted speed after receiving permission to move. Restricted speed is defined under federal regulations as the speed that will allow the train to stop within half the range of vision. This ensures that the train can respond effectively to any unforeseen obstacles, such as another train, maintenance work, or any other conditions on the track.

Approaching at restricted speed provides the conductor with better control of the train and increases safety by allowing adequate time to react to any potential hazards. This is particularly important in areas where visibility may be limited or where unexpected conditions might arise.

In contrast, the other options do not align with safety protocols established for train operations. For instance, proceeding at normal speed until further notice could lead to dangerous situations if there are obstacles ahead. Similarly, a fixed maximum speed such as 10 MPH or specific speed requirements set by a control operator may not take the unique circumstances of the situation into account. Hence, the requirement for a train to operate at restricted speed ensures a standard approach to safety that is applicable regardless of specific operational circumstances.