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Sprinter (Class 15x) units carried the last three digits of their carriage numbers in the 52xxx and 57xxx series. The 6xx series was reserved for the aborted Class 157, and was adopted by refurbished Class 143 601-625 and 101 651-695. Refurbished class 117 and 122 kept their Tyseley 3xx and Laira (Western Region) 1xx unit numbers respectively.
Even then, many units displayed only the last four digits, dropping the first two digits – e.g. unit 412 301 would have the number "2301" applied. Only with later units and 2xx series DEMUs were the full numbers shown, e.g. Classes 456, 458/5, 465 and 466, and some Class 455 sets, carry full six-digit numbers.
Of course, many exceptions arose over time. One major change was to change the classification of unpowered trailer units from 49x numbers to 4x8 numbers (which involved reclassifying Class 491 to Class 438). When Southern Region unit numbers were changed to fit with the TOPS classification system, former 4x0 classes were all reclassified to 4x2.
Class 205, no. 205032 at London Bridge on 15 August 2003, with a service to Uckfield.This unit is now preserved on the Caledonian Railway.. The British Rail Class 205 diesel-electric multiple units were built by BR at Eastleigh from 1957 to 1962, and in service for 47 years from BR Southern Region to Connex South Central and finally to the Southern franchise.
A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.
Only the tally marks for the numbers 1 and 5 are encoded, and tally marks for the numbers 2, 3 and 4 are intended to be composed from sequences of tally mark 1 at the font level. Counting Rod Numerals [1] [2]