This is accomplished by carrying the circuit for the stick relay through a back contact on the track relay. so that the former relay will not ... In case the track relay rea mains down or the local battery fails, the towerman must go downstairs, break the glass of the box and ... As the control wire to the line relay for the home signal is carried through front contacts on the emergency switch. the home signal willanbsp;...
|Title||:||The Signal Engineer|