Color appropriate and intensely bright.  Should work for your application.

If you're looking for an outstanding tri-color SMD LED or otherwise, check out the Tri-Color LED (606 size), available from Showcase Miniatures, it is fantastic.

This a great LED. With the continuing advancement of technology, these LEDs are a blessing to the model railroading hobby. It is amazing how this small package contains 3 colors.

Unbelievable how small this product is. To be able to mount the wires on the pc board is incredible! And it works! Leds are bright. Only thing I had issues with was dealing with how small the gage of the wires. Seemed impossible to solder to anything, even to themselves. Other than that, a very good product.

The detail, and scale dimensions are excellent, however, the resistor value on the 3 way light is WAY to high. I had to reduce it to 1k for the green light to work. Once reduced the block signal was accurate and worked perfectly. This is in reference to using the two light system.