In the Tokyo area there is the Nissan engine museum in Yokohama, which is interesting. Upstairs there is an exhibit about the Nissan works in Yokohama. Then down the road there is the new NISMO showroom for the Nissan motorsports division. You can view the workshop area through plexi-glass.

Not sure if it is practical to get there by train but I am sure there is a station within a mile or so.