U.S. source of tri-color (Red-green-white) common anode LEDs? - Model Railroader Magazine

Those wiley Brits seem to be ahead of the curve again... first the Beatles, and now this  

 The LED is actually tri-polar...according to their website..."A 5mm Common Anode (Positive or tripolar type) DCC friendly LED
Tri-Colour: RED, GREEN & White.

Designed by DCC Supplies, for compatibility with DCC Decoders, primarily for American modellers, similar to our bipolar red/white LED (although it has many uses everywhere!), these LED's are intended for use as classification lights, (see below for definitions)
The LED has four connections, the Common positive, and the negative (Cathodes) for the RED, Green and White lights. Of course, any part of the LED can be used, and in any combination, so if you only require a Red/Green or Red/White common anode/ Bipolar LED, then this device is also ideal!"

The company is DCC Supplies <=== click to see for yourself

I may just use separate white and R/G LEDs...has anybody tried to cram 4 LEDs and the accompanying resistors in an Atlas Trainman RS-36? Any helpful hints?

I was think of using the LEDs to light fiber optics that would run to the class lights...I could put together a small PCB to hold all the electronics if there is room under the shell.

this is off topic, but...for the fiber optics i was thinking of using a scrap of clear plastic sprue as sort of a light bar. I would drilll holes for the LEDs on one side and holes for the fiber optics on the other. I haven't experimented yet, but my thought was that this would allow me to run just one strand per class light and be able to handle mulitple colors. (pats himself on the back)