Telephone related items which are non railway
Mechanical master clock, produces a 30 second pulse for slave clocks.
This one is fitted with a syncroniser circuit, all master clocks were sent a signal at one o' clock every day. These items are rare, normally being removed.
A small piece to show it can all be done with relays (almost)
In the days of Strowger larger exchanges had automatic routiners that tested the equipment at night. If a fault was detected the information would be sent to a Docket Print Machine that would print the details of the fault on a roll of perforated pink paper, example shown below.
Details printed along the bottom were the routiner that detected the fault, the equipment concerned and details of the fault. Also included was the date and month possibly there was also a docket serial number.
The Docket Print Machine had a clock and calender based on uniselectors, so different routiners could be strapped to start on certain days and certain times if required.
This was so comprehensive that it even allowed for February 29th, so once every 4 years LY relay (Leap Year) would operate for one day only.
Tadburn - a temporary exchange in the Romsey area, used while awaiting the Crossbar exchange being placed in service
During the Cold War the GPO built a number of repeater stations hardened against fall out.