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.
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.