Manual, paper with card covers, PORTIS Operator's Manual, issued by the British Railways Board Apr. 1986. Describes the operation of the PORTIS (PORtable Ticket Issuing System). Cover is glossy with colour illustration of a PORTIS machine on the front and inside. BR document no. 4592/34. 63pp. A later amendment has been inserted loose inside the front cover. Belonged to Robert Hilton, signalman at Whittlesey signal box, Peterborough.
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