I Made my own Twin T block detectors and they work perfectly controlling three color signals. Each Yellow aspect is wired into the red aspect of the advance block. The Twin T's control a 4 pole relay that allow other functions to perform automatically like crossing flashers and lights to come on at the station and freight house, ect.
I seldom run trains and mostly do it alone.
Sound was made to come on through the block relays with speakers for each block. This became tacky after a while. Then I got a steam engine that has all the bells and whistles with DC. now that is really great. This puts off the need to go DCC a little longer.
Every one has a short in the track work now and then. That is when all those block switches come in handy for isolating the problem quickly.
I like wiring anyway and the caveman control with "stopping diodes amuses me to see it work.
This system is not better that DCC, but it works for me.
I spend more time with my operating hump yard, loading live coal loads, and animation in the engine service yard like operating round house doors and loading coal into tenders.
Then that part of the hobby of building intense urban scenery has my attention for now.
-- Phil Anderson Up hill slow, down hill fast, tonnage first, safety last.