Much more is needed than just a capacitor. 1) the track polarity may change 1s a full bridge rectifier is needed. 2) the voltage will change on the track depending upon speed. I use 12 v strip leds, thus put a 12 volt regulator inline. 12 v LEDs will operate down to about 7v these are polarity sensitve also. 3)finally a smaller capacitor is put in line between the voltage regulator, be carefull about polarity. The diodes in the rectifier will stop any reverse current to the track.  I make these up using a cut piece of circut board with  linear traces. 4 holes wide and 6 long being sure to cut the approprate trace that between the bridge rectifer and capacitor.

Quite a few Ebays sites sell strip led lights. These come in warm white, are 12 volts dc and have their own adhesive to stick to the tops of the cars. They work on a 9volt battery and an on switch. or for my USATs, I have used track power. This requires a full bridge rectifier, 12v transistor and a small capacitor(to reduce blinking with poor pickup).

Bill
Ditto your experiences. I help maintin a G scale setup for an HO club that has it in a Cerbral Pul. center. Exactly same problems. We get lots of used brass from a gut that maintains a grocery chain setups. ahve to cut off 1-2 feet on each due to wear on corners. Used to be that LGB trucks rn foreve. But not so anymore. I know Gary is using USA locos as the trucks seem to have the longest life.
'Stainless isn't. meaning depending upon grade, it will rust. We are  used to 316 stainless for tableware and many other home uses. Some track is 306 ss and some manufacturers use 303 (magnetic) as it extrudes easier but also rusts more readily.

Two things to remember about stainless track 1) Stainless isn't. 2) Stainless is harder than the wheels on your engines. This means additional wear on the wheels, especially if you have a lot of curves vs straight track. Although brass requires more maintenance, it becomes the sacrificial metal versus the wheels on the engines or rolling stock. Stainless also tends to squeal more on corners. A local chain grocery store has trains in all 50-60 stores. Stainless was tried in some but was necessary to remove as the squealing irritated the shoppers. Each type has their pro and cons.

$150 range. With Accucraft at $209.They have an established market. Need to come in less if one wants to penetrate this market.

HURRAY!!!!!

I am sure this has been covered a million times, but could someone tell me where to put magents on the wheels for chuff? there appears to be no room as what is exposed adding anything will get caught in the switches. Or is there another solution such as the gear shafts?