BR(M) booklet Signal Boxes Opening Hours Crewe and South, 15th September 1958 ufn.
West Of England Railway Signal Boxes List Booklet Lots of Techncial Info
BR(M) Hours of Opening of Signal Boxes booklet Midland Lines 1962
1970 Reporting of Trains Between Signal Boxes BR Railway Booklet
1961 North Eastern Region Hours of Opening of Signal Boxes Railway Booklet
Vintage BR London Midland Booklet. Hours of Duty of Signal Boxes. 1949
Wrexham Central N Signal Box & Hawarden & Dee Marsh Jct Signal Boxes BR LMR
