PRIVATE BRANCH RAILWAY EXCHANGES
These switchboards are specially designed to meet the particular requirements of railways.
The sections are constructed of hard wood with ironwork fastened thereto for mounting apparatus
The keyboard is covered with fibre and has capacity for 17 cord circuits.
Lamps are used for line and supervisory signals.
The jack field is arranged to accommodate a variety of circuits peculiar to railway work, and the stile bars are clearly engraved to indicate the circuit, e.g., "Rly. Trunks T2218." When the public exchange is automatic a dial and dialling facilities are provided for the exchange lines.
A 24-volt battery floated by rectifier on a.c. mains is recommended for power supply.
Taken from the Ericsson catalogue, edition No. 49
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