Abstract: China's heavy haul railways are mostly typical mountainous railways, with high risks of natural and geological disasters, which increases the safety risks of heavy haul train operation. In response to the challenges of long braking distance for heavy haul trains, limited visual distance for drivers, and inability to handle in advance when a dangerous situation occurred in front of the train during operation, this paper studied the remote monitoring system for heavy haul railway locomotive, as well as key technologies such as correlation matching, video access and processing, and monitoring information access. The system was demonstrated and applied on the Shuozhou-Huanghua railway. The application situation shows that the system can provide video monitoring and danger warning for locomotive drivers beyond visual distance, assist drivers in detecting and handling danger in advance, and ensure the safe operation of heavy haul railway trains.