Here's an interesting video by ya1964ma. In the description, he speculates that this is either for JR East's simulators, or for a new Densha De GO game. Most of the comments latch on to the latter possibility :). ya1964ma states that this operated between Matsumoto and maybe Otsuki.
That's some serious looking camera equipment, capturing both the driver's and conductor's vantage points. There are also microphones.
please release it for the Switch please release it for the Switch please release it for the Switch please release it for the Switch please release it for the Switch please release it for the Switch please release it for the Switch thanks