Which system is commonly implemented for freight locomotives to enforce speed compliance?

The Locomotive Speed Limiter (LSL) is specifically designed to automatically restrict the speed of freight locomotives to ensure compliance with designated speed limits. This system plays a crucial role in enhancing safety and operational efficiency by preventing the train from exceeding its maximum allowable speed, particularly in sensitive areas or where stringent speed regulations are enforced. By automatically intervening and limiting the throttle of the locomotive, the LSL helps to mitigate the risks associated with speeding, thereby protecting both the crew and the public.

In contrast, other systems like Automatic Train Stop (ATS) and Automatic Train Control (ATC) serve broader functions such as stopping a train in emergency situations or providing real-time control of various operational parameters, but they do not focus solely on speed limitation. Centralized Traffic Control (CTC) primarily manages train routing and scheduling over a control area rather than enforcing speed compliance directly. Thus, while these other systems contribute to overall train safety and efficiency, the LSL is specifically tailored to enforce speed compliance in freight contexts.