Power Railway Signalling

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Chapter XVI. - accessories for automatic signalling. - Switch locks - Track-circuits for siding connections and crossovers - Insulating point rodding, &c. - Swit_ch indicators - Commutators - Switch instruments - Switch controllers - Relays - Signals for level crossings.