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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,〔List of locomotive classes published in ''The Railway Magazine'' in September 1968〕 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. ==Locomotives== The first attempt to apply TOPS differed from the later approach in two significant ways: * xx/0 was not a valid sub-class number. When the second arrangement was applied original subclasses xx/1 became xx/0, xx/2 became xx/1 and so on. * Some detail differences within classes were considered sufficient for a different class number to be allocated, rather than indicate it with a sub-class. In addition, there are a number of cases where conversions led to complete reclassification, where similar circumstances later would be indicated simply by allocating a new subclass. The change in approach led to some odd gaps in the list of locomotive classes when they were re-arranged as the principal class numbers were retained unaltered. Classes affected by this change in approach include: * * Class 29 (re-engined Class 21) * * Class 31 (re-engined Class 30) * * Class 34 (became Class 33/1) * * Class 43 (North British Locomotive-built Class 42 with different make of engine and torque-converter) * * Class 48 (Class 47 with experimental Sulzer vee-formation engine; later rebuilt to standard class 47 with in-line twin-bank engine) * * Class 72 (became Class 73/0) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「British Rail TOPS first arrangement」の詳細全文を読む スポンサード リンク
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