• Trains can run forward only.
  • For a given run only one train can be assigned one of the paths. i.e., Only one train will be assigned the large oval. If two trains were assigned the large oval going in the same direction the run would be trivial, in opposite direction the run would be short.


  • Trains are just an engine, locomotive or "loco" in this case a Plymouth ML-8 Industrial Switcher. Trains will be referred to by their color Black, Red, Orange, Yellow or Green.
  • The order the trains are 'parked' is arbitrarily in IEC (International Electrotechnical Commission) color code order. If a given run does not use all trains, 'the invisible hand of god' removes the unused train(s).
  • Clockwise, Counter-Clockwise are defined as on the left-hand end of the oval/figure-eight track layout.
  • In the Contents at left, new/updated entries have a * to highlight changed content in the current (weekly?) update.
  • Power bus:
    • Following other conventions, 15vdc is 15 volts DC, more or less. 5v0dc is 5.0 volts DC with tighter regulation of the output voltage. The "v" (5v0dc) replaces the decimal point which may missed, which would cause problems. There is a critical difference between 5v0dc and 5.0vdc if you don't see the decimal point!
    • Red/White, Red 15vdc, White common (Power supply to Motor Shield). Red/White twisted pair 15v bipolar PWM DCC signal from Motor Shield to the track and all DCC controlled elements. (Lite blue/yellow twisted pair Program mode DCC from Motor Shield to switch and block #14.)
    • Black/Green, Black 5v0dc, Green common. 5vdc for Arduino, Raspberry Pi, PWM HAT/Bonnets, IR sensors, Turnout LED indicators, etc.
    • Orange/Blue, Orange 12vdc, Blue common. 12vdc for 60 semaphore LED lights and 4 dwarf signals in the parking lot. (This was 1v5dc until the semaphores design changed.)
  • Steam locomotives were invented in England and for whatever reason the engineer sat on the right side of the loco. This is still true and so that the engineer can see the signals he must follow, the signals too are on the right side of the track.
  • The aspect of the top signal on a pole reflects the mainline, i.e., the large or small oval. This would be through switches in the CLEAR position. The aspect of the lower signal on a pole reflects the status of the divergent route through a switch in the THROWN position.