For ATC systems, what happens when a train follows a non-ATC train?

In Advanced Train Control (ATC) systems, when a train equipped with ATC follows a non-ATC train, the ATC train's Minimum Allowable Limit (MAL) adjusts to the track position of the non-ATC train. This adjustment is essential to ensure safe operation because the non-ATC train does not have the same safety features or performance regulations that the ATC train adheres to.

By modifying the MAL, the ATC system allows for safer spacing and movement of the ATC train in relation to the non-ATC train, thereby minimizing the risk of accidents or collisions that may occur due to unexpected stops or speed changes of the non-ATC train. This adjustment also helps maintain the operational efficiency of the rail network while operating within safety parameters.

The other options do not accurately reflect the functioning of ATC systems in this scenario. Stopping the ATC train immediately would impede service and is not a standard response to encountering a non-ATC train. Disabling the ATC system could lead to significant safety risks, as the ATC features provide critical protections against collisions and excessive speeds. Accelerating to overtake would not be prudent since it could lead to unsafe conditions given the non-