Controlling signals on a large DCS layout

[gunrunnerjohn]

Just insert a 33uh choke in series with the power coming from the center rail and your power supply will not degrade the DCS signal.

[cruikshank]

We are building period correct Reading RR Block Signals  using common cathode dual color ultra bright LEDs. Our previous signals were controlled using cut outside rail. We used the AC track voltage rectified to control relays.  This worked, but we are now going to triple the amount of signals. Our concern is degrading the DCS signal. So we can continue to use track voltage rectified to control the relays, or possibly use a DC supply and use the control  rail to complete the ground and control the relay. Or perhaps since the LEDs only draw about 30ma we could us a logic IC circuit.  Because of reliability we don't want to use infrared or optical detection. Also AC coil relays are less available and more expensive than DC operated relays. So we are open to known working systems that wont degrade the DCS signal.  Any ideas?

Thanks, Dave North Schuylkill High Railers