The Signal House Group brings together three specialised engineering companies offering substantial experience in railway signalling. Collis Engineering Ltd: For excellence in signal structure design, engineering and fabrication and manufacture of Points Operating Equipment. Collis Civil Engineering: For excellence in signalling civil engineering - Full ground investigation service, substructure design and installation, superstructure installation, structure refurbishments. Signal House Ltd: For excellence in LED railway signals and signalling components. LED Colour Light Signals, LED Banner Signals, LED Indicators. We believe that such a complete service, from within a single company resource, is unrivalled in the railway. The Signal House Group – a single contact for a complex contract.