Track Circuits or Axle Counters. They let us know where the trains are and can’t go wrong. This lets us have trains moving at 125mph only a few miles apart.
In my case, the most useful object is my sketch book! If I can’t sketch a design/idea and doesn’t make sense in a simple drawing, it is probably not a good design.
After sketching, we used computarized tools (CAD) to get more accurate drawings and dimensions.
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