Everyone would agree that flickering lights on our passenger coaches and guards vans/cabooses/Brake vans is very annoying. Even with clean wheels and track and good pick-ups they will flicker. This blog will show you how to make a relatively circuit to minimise this effect.
The circuit diagram shown is from a US Modeler Jim Betz. This circuit can be used for DC and DCC to power the LEDS. There are a myriad of ways to install pickup and lights which are beyond the scope of this article. The circuit can be tried with incandescent lamps but due to their higher current draw they require a higher valued capacitor eg. 1 farad Super Capacitor.
Using the circuit on DC is not polarity dependent. If requiring directional tail lights on a guards van etc., some form of switching is required. Using high intensity LEDs, you will have to adjust the Voltage Dropping resistor so you can have currents that provide a good intensity to less than 1mA.
Pro tip: experiment here. I use 1000ohm ½ watt resistors. The lower current being consumed the fewer flickers you will get. These parts are easily sourced online. They cost around $3 (AUS) per unit.