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THE TELEGRAPH DEPARTMENT
The Telegraph department maintain the railways telephones and telephone exchanges which connect the signalboxes, station buildings, signal post and point zone telephones.The department currently operate two linked telephone exchanges, one located at Darley Dale and one at Rowsley in an ex British Telecom mobile exchange unit.The first exchange upon the railway used small office Strowger exchange equipment, this was later replaced with larger purpose built exchange.The department has been fortunate to aquire equipmwent surplus from the M.O.D and from other railway operators such as the Crich Tramway Museum as well as from British Telecomms itself.
(Above); Strowger selectors and (above right) the Rowsley exchange equipment.
Currently the railways internal phone system comprises of;1. Omnibus circuit between Church Lane, Darley dale signal boxes and Rowsley booking office2. Lineside direct dial telephones between point zone telephones and ground frames to theassociated signal box as well as signalpost telephones.3. Ancilliary telephones between station buildings, offices etcetera.
The line finder is a uni selector (one field of movement) its purpose is to find a path through the exchange so that the system can then connect you to the exchange, when this occurs you get a dial tone on your handset
Once connected the numbers you dial,operate a selector which has two planes of movement, this allows a contactor to make a unique path through other selectors and final selectors to its unique destination
THE CONTACTOR ARM INSIDE THE SELECTOR,WHICH ROTATES THROUGH THE OUTPUT CONTACTS
THE CONTACTOR ROTATES THROUGH THESE STACKS OF OUTPUT CONTACTS INSIDE THE SELECTOR
CLOSE VIEW OF THE CONTACTOR MAKING ONE OF THE OUTPUTS
HOW IT WORKS!