RAILROAD COLOR LIGHT BLOCK SIGNAL FOR LEDs, 2 UNIT, N SCALE
_____This model is of a "Color Light Block Signal" that allows for the installation of LED's to light it and having two (2) light units on the pole. Modeled (very) loosely after a photograph of one._____
_____There are 3 horizontal pieces going from the ladder to the pole that are for support and strength to endure the Shapeways cleaning, packaging, and shipping process. The modeler may want to remove them to obtain the correct look and feel of the model (although it will make the ladder un-supported and a weak point)._____
_____The model can be lighted using a small SMD Pico Chip LED. This Light Emitting Diode is a Surface Mounted Device that is on a very small chip with wires attached to the chip. The name, Pico, refers to the very small size. An internet search should provide plenty of sources to purchase these devices._____
_____We used the Evan Designs Chip Pico red LEDs for the signal head lights that can be controlled by a crossing gate sensor. The LED dimensions are 0.5mm x 1.0mm x 0.93mm which includes the LED, the chip, and the wire. The dimensions of the two twisted wires for the Evan Designs Chip Pico LEDs was 0.38mm.
The column of the block signal, with an inside diameter of 0.635mm, is hollow to accept very small wire such as magnet wire.
The column of the block signal also has an opening in the back behind the signal lights for the wires to easily and almost invisibly reach the signal light heads._____
_____NOTE: Attempting the installation of very small LEDs and the associated wiring is not for the less than average modeler. Some skill and a great deal of patience will be required._____