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At the end of the 1960s, British Railways adopted the Total Operations Processing System (TOPS), a computerised system developed by the Southern Pacific Railroad in the United States. All types of locomotive and multiple unit received a TOPS classification,[1] but the first attempt at applying TOPS was soon modified. This page explains the first attempt at using TOPS and cross-refers the classes allocated with those adopted in the successful re-arrangement. An explanation of the final arrangements for TOPS classification may be found here.
^List of locomotive classes published in The Railway Magazine in September 1968
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successful re-arrangement. An explanation of the final arrangements for TOPS classification may be found here. The first attempt to apply TOPS differed from...
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