aarg:
Point sensors have inherent problems - for example:
A sensor at a block boundary becomes active.
Was the train going east or west? Big difference as far as block occupancy.
my point exactly... at the price of "block sensors" you can only afford to use the bare minimum... which is usually not as many as you'd like. but at less than 25 cents for a hall sensor you can put as many as you want. the way it works is by passing any two sensors you now have the direction and speed. if your running Train Controller that is.