Supplementary Operating Instructions

Supplementary Operating Instructions were issued irregularly and combined updates to multiple official documents into one; the source documents should be read in conjunction with the SOIs to appreciate the change in the rail network and operating methods over time. They often combined updates published elsewhere in Periodical Operating Notices with other amendments. See also the list of Periodical Operating Notices and Sectional Appendices in the library.

British Railways North Eastern Region

British Railways Eastern Region

Northern Area

Southern Area