Okay F3LON, I own the game and I played the game and here's the lowdown. You are a train conductor and trying to get your train from point A to Point B on time, sometimes you also have to pass certain points on time, because if you do you get bonuses (and additional assurance that you will reach your destination safely and soundly). Know the famous saying that the trains in Japan are always on time? That's your job. You are first at a dead halt, waiting in a station until you're given the green light, so that you can release the emergency brake and accelerate your train. From there on, adjust your speed and acceleration, and find the best way to arrive on time without endangering your passengers or pedestrians (you are graded on your acceleration, braking, stoping, obedience to local traffic laws etc. when you complete a course.) Things you must pay attention to:
1. You must obey local traffic speed limits when they are present.
2. Remember to sound the horn when you pass railroad crossings, as well as entering tunnels (the latter will give you extra time if done correctly).
3. When you are about to reach your destination, be careful not to accelerate while in the station.
Densha De Go 2 has got to be one of the most loved arcade games in Japan. It tests your math and physics ability, while getting to operate a train, one of the Japanese's passions, since most people ride one while commuting to school or work at one point of their lives.
Here's the simple lowdown on the operation:
Default controls:
right - Release emergency brake
left - active emergency brake
up - accelerate your train
down - decelerate your train
right button - professional mode (hides your speed)
left button - honk horn
Those japanese sure have a different taste than us Americans. loco 
