HO Scale Model 10 Grade Crossing Kit Assembly Required Our HO Scale Grade Crossing Signal can be lighted with our 603 LEDs in the head housings and the 402 LEDs in the arm,.AND….it contains parts for you to make it operate! The kit will include stainless photo-etch details, brass tubing, pewter, and resin parts to make ONE SIDE crossing. The movement of the arm in the video is done manually (see video in this listing).This kit can be built with or without the arm and includes your choice of 12', 16' or 20' signal arms. A pushrod and clevis assembly simplifies the means to animate the signal arm. You will need a servo controller and flasher circuit to fully animate the signal. The kit also includes a magnetic "break-away" base. You may also view the instructions by looking at the pictures in the listing. We recommend our #603 size LEDs (4 each for the head housings) and 402 size LEDs (3 each for the gate if you want the gate lighted) LEDs are sold on our website. Our specifically designed LEDs use very fine 40 AWG wire which allows for easier fit down the tube and across the gate. If multiple kits are purchased, they most likely will be packaged together. by Showcase MiniaturesModels and Kits produced by Showcase Miniatures, including Century Foundry products, are intended for model builders 17 years of age and older. These products are not children's toys.