Clean up the residual coal at the bottom of the carriage. Has anyone done it? How? Every few minutes?

At present, all train cars in China are cleaned manually. The cleaning staff opened the door of the carriage, and after entering the carriage, they cleaned up the remains in the carriage with shovels and brooms, and then swept them out of the side door of the carriage and scattered them beside the train tracks. After getting off the train, the sweeper will reseal the side door of the train carriage, and then collect and transport the remaining materials scattered beside the train track. It takes about 10 minutes to clean a carriage, and there is about 100 Jin of coal left in the carriage.