Use a modified Bachmann(TM) HO Block Signal with 2 LEDs added
This project involves adding a Green and Red LED to a Bachmann HO Block signal and operating it manually using a 9 Volt power supply and DPDT switch. Both signals can also be operated automatically using a microcontroller along with a simple train occupancy detection system. Kits are available for trying these projects.
Add LEDs to a HO Scale Block