This is how to play Trains
 
1) Setup Dosbox for Tandy Mode and Tandy Sound and slow it way down Under 400 works well.
2) The Keys to Use The arrow key move the train backwards and forwards and turns the train.
    Turning is a bit tricky you hold down the direction you want to go based on the the engine position.
3) The delete key handles the other functions. and works the same as a joystick number 1 button.
    The delete key will sound the horn and pickup up and unload cargo. 
    If the Delete key does not sound the horn DOSbox is running to fast. Slow it down and restart the game.
    When you stop a car on a supply site and press the delete key the car will fill (noting that it the right car for the supply)
    Take that car to the demand site and press the delete key and it will unload. The L key will tell you the different industries.
4) The space bar key will tell you the supply and demand levels. Once you start empting a supply you will not be able to fill your train car.
    But deliver it anyway. Once you command control of supply and demand of the level a track will grow that will take you to the next level.
5) The train runs on coal if you run out and out of money the game is over. Fill up using the delete key on the engine when you pull up to a coal site.
 
-Greg
 
P.S. The Delete Key will stop the train for you at a site if you are going under 9mph