I know nothing about subway in the US, but living in Japan, most systems here still have 2 staff per train. The conductor job here includes confirming overall s

I know nothing about subway in the US, but living in Japan, most systems here still have 2 staff per train. The conductor job here includes confirming overall safety of the train (including confirming stop position), open-close door, and general communication to the passengers. There are systems here that use 1 man to operate, but those are generally the lower throughput system.