Treadle switch and siding warning indicators.
The first of the scratch built prototype switches
Next a slightly thinner design with new bolt type.
The final design fitted between the sleepers.
Testing
Close up view showing how tiny the gap is and needs to be.
The wheel flange is only about 1-2 mm below the
bullhead rail and therefore adjustment is finite
Final and complete. the first of these indicators is done
and working, in the video we can see the indicator
blinking and the loco pulling out of the siding.