The Displays:

  After the splash page comes up, click All Aboard and you are
  presented with 2 windows. The clock window is on the top right.
  Default is to have Midnight displayed and set to run 8 times fast.
  Also displayed is the speed ratio and start time at the bottom of
  the window. These will be auto scaled with changes to the main
  digits via the Clock menu. The information window is on the bottom
  left. It tells you if you are transmitting packets and if so, how
  many serial bytes are used, the time in microseconds to send that
  data, and the rate in cycles per second that a packet could be
  repeated.
  
  The Loco windows default to no locomotives, and therefore are not
  visible at startup. Choose Add Locomotive... in the Setup menu for
  the dialog to define a locomotive or Open Loco... to read in a
  saved locomotive setup. Choose the Setup menu item Transmit Data to
  start sending packets addressed to the locomotive(s) displayed on
  screen. Once transmitting packets, the window(s) will not close
  until you turn off packet transmission.
  
  The Accessory windows default to no accessories, and therefore is
  not visible at startup. Choose Add Accessory... in the Setup menu
  for the dialog to define an accessory. Choose the Setup menu item
  Transmit Data to start sending packets addressed to the accessories
  displayed on screen. Once transmitting packets, the window(s) will
  not close until you turn off packet transmission.
  
  You can double click the mouse button on the function control boxes
  to make them flash (rate is set in the Setup dialog). If you single
  click on them they will turn on and off as expected, and if they
  are flashing then it will delay the flash by one cycle. (Useful for
  alternating the flash of two functions such as ditch lights).
  Double clicking on a locomotive or accessory display area other
  than a button, box, or control will bring up the Setup dialog box
  for that locomotive or accessory. The data out the serial port
  should be unaffected by this operation except with old, slow Macs
  that may make the locos jerk a bit while the window is loaded. The
  locomotive or accessory is then "selected", making it the one to be
  saved via the File menu and its data displayed when programming
  registers. A single click on the display area will "select" that
  locomotive or accessory. Keyboard control of a locomotive that has
  been selected is explained in the Keyboard Control chapter.