Advanced Construction Signals. Aimed at modellers with more experience, these kits enable you to custom make specific configurations of signals to suit your track layout and train paths. This kit will make either 4 separate signals, or combinations of bracket signals plus 4 Ground Signals. It can also be used with the Pratt Truss Gantry kit (Ref 478) to provide over track signals. Glue and paints required to complete model.