Mounts on the wagon. The trainline provides the CCID power and brake commands. The CCID in turn provides power to the ECP manifold and smart devices like empty load or handbrake. The CCID intercepts and acknowledges the trainline messages and sends brake commands the ECP manifold. The CCID has a battery backup for situations where ECP power is off; ECP can continue normal operations for up to 4 hours.