What speed is allowed when cab signals are also cut out in ABS territory?

When cab signals are cut out in Automatic Block Signal (ABS) territory, safety protocols require trains to reduce speed to ensure safe operation without the additional protection those signals provide. The correct choice indicates that different maximum speeds are established based on the type of train, distinguishing between passenger and freight services.

Specifically, passenger trains are allowed to operate at a maximum speed of 59 MPH, while other types of trains (likely referring to freight trains or non-passenger services) are limited to 49 MPH. This tiered approach recognizes the higher risk characteristics of freight trains compared to passenger trains and allows for greater caution in situations where cab signals are not in use, ensuring operational safety while still providing reasonable speeds for different train types.

This nuanced understanding of speed limits reflects the commitment to maintaining safety across various operational circumstances within the realm of railroad operations governed by the NORAC rules.