- Set Locomotive constant to the max number of trains to ask for. - Set Wagon constant to the number of items stored by a locomotove. Don't forget the stack count. - Set SIG-A to the storage capacity - small amount - Set the last arithmetic combiner's output to the material being used. - Attach the L combiner's output to the train stop. - Set the train stop to input train limit - Attach last combiner's output to the RED global wire.