Replaced the flashing yellow LED in the 8 double head signals plus 3 other signals that had defective LED's.
Used a hobby drill press to drill out the old LED's starting at 1/16" bit, then 3/32" and, finally, an 1/8" bit. Had to move the wires to one side before drilling out the LED's from the front.
Installed two more double head signals.
One at Glacier.
The other at Shelby; in the non sceniced area of the laundry room but still needs block control at a turnout.
Still have two places to install signals.
The tracks leading into Seattle's yards.
A 'crossover' still needs two more double mast signals.