The vehicle was most probably produced pre 2nd World War
The GPO purchased 5 coaches but it cannot be confirmed if they were
all exactly the same type.
An article from the Post Office telecommunications Journal - August 1955
First Mobile Call Offices launched
The first group of public telephone call offices on wheels in this country was driven in June from London to Norfolk to open for service at Norfolk Agricultural Show. Its official name is the “Mobile Telephone Unit” or “Mobile Call Office Unit”; colloquially and popularly it might well become known as the
Finally, the coach was painted and embellished - Post Office red, gold and black - in the Engineering Department’s workshop at Yeading.
By key switching in the attendant’s booth, the telephones can operate to C.B. manual or automatic exchanges, including unattended automatic exchanges (except type Nos. 5 and 6); C.B.S. and magneto working are not catered for. The attendant’s booth contains a telephone for service to the exchange staff.
When the coach arrives on the spot, a 15-pair polythene cable will be laid over ground to the nearest permanent line plant. More than 60 yards of cable are carried.
Power for interior lighting, and for driving the ventilator vans is drawn from the car battery, which is considerably larger than would be needed merely for starting and exterior lighting. A small charging set is included for the larger charging rate. An A.C. mains source, instead of the 12-volt battery, can be used for lighting and ventilation.
The vehicle is exceptionally neat and compact. The overall length is 24 ft. 6 in., and the width 7 ft. 6 in. The wheel base is 14 ft. 8 in. long and 7 ft. wide.
The unit will work in the London Telecommunications and Home Counties regions. It will attend such events as agricultural shows only when not called on for emergencies but, should the need arise, it can be pulled out and rushed at once to the scene.
Customer cubicle also showing part of the Attendants desk to the right
View of the cab
Last revised: March 26, 2021