BR(M) booklet Signal Boxes Opening Hours Crewe and South, 15th September 1958 ufn.
BR(M) Hours of Opening of Signal Boxes booklet Midland Lines 1962
1961 North Eastern Region Hours of Opening of Signal Boxes Railway Booklet
Vintage BR London Midland Booklet. Hours of Duty of Signal Boxes. 1949
West Of England Railway Signal Boxes List Booklet Lots of Techncial Info
LMS Midland Division booklet Hours of Duty at Signal Boxes South of Hendon 1944
1970 Reporting of Trains Between Signal Boxes BR Railway Booklet
