When the TOPS system was first introduced different Class numbers were applied to individual coaches of a multiple-unit. The driving cars were a different Class from the trailers and so on. This was rationalised later so that the whole unit was of the same Class. Also over time mechanical and body changes meant that some units were reclassified. Most of these changes have been documented in books and on websites so I leave it to the individual to do their own research. On these pages I have tried to use the unit Classes which were used after the initial multi-Class approach. However I am sure that you will discover errors in my attempts to "get it right". If you spot any please use the Contact link to tell me about it.
Class 100Class 101/102/111Class 103Class 104Class 105Class 107Class 108Class 110Class 114Class 115Class 116Class 117Class 118Class 119Class 120Class 121Class 122Class 123Class 124Class 125Class 126Class 127Class 128Class 140Class 141Class 142Class 143Class 144Class 150Class 151Class 153Class 154Class 155Class 156Class 158Class 159Class 165Class 166Class 168Class 170Class 171Class 175Class 180Class 185