DR>> Haven't you been inside train cab? Drivers's seat at the center is DR>> only DR>> in Sapsan, all common trains and locomotives have driver's seat at DR>> the right side, and assistant's seat at left side. WD> What does the assistant do? Read the map and give directions? He helps driver to solve some problems without need to stop train when it needs to leave his seat for this. And kicks driver's ass when it seems that he fall asleep )). He can even drive the train when driver can't continue driving.