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==Internal User vehicles==
Internal user vehicles are items of rolling stock that are used for internal purposes at one fixed location from which they are unlikely to move. An example of a wagon on the SVR which previously served an Internal User role is [[GWR 80990 Cylindrical Tank Wagon| 80990]] which finished its working life as a waste oil storage tank at the Landore Diesel Depot.
==UIC numbers==
Modern railway stock is numbered using '''UIC Numbers''', also referred to as '''RIV''' (Regolamento Internazionale Veicoli) numbers or '''EVN'''s (European Vehicle Numbers). These are a Europe-wide standard method of allocating a unique number to individual items of railway rolling stock. The UIC number consists of 12 digits:
*Digits 1-2: The Exchange/Interoperability Code (simplistically the high-level type of vehicle)
*Digits 3-4: Country Code
*Digits 5-8: Vehicle type/class (digit 5) and sub-class
*Digits 9-11: Individual serial number
*Digit 12: Self-check digit
Taking as an example one of the GBRf IIA hoppers which took part in the Goods Gala in June 2018, the wagon was numbered 8170 0659 032-4. This gives the following information:
*81: denotes a Bogie wagon, fixed gauge, railway undertaking owned, non-TSI compliant
*70: denotes United Kingdom
*0659: 0, equivalent to Type code category letter "T", denotes a Goods Wagon with an Opening Roof. The next 3 digits are the sub-class
*032-4: Individual wagon serial number 032 and check digit 4
The number may be shown with different spacing (for example 81070 659032-4) or displayed on several different lines.
Even small items of on-track plant (classed as 'special vehicles') may be allocated an RIV/EVN number, such as the SVR's mobile elevating work platform (99709 942098-3)
==See also==
==Links==
*Wikipedia: [https://en.wikipedia.org/wiki/British_carriage_and_wagon_numbering_and_classification British carriage and wagon numbering and classification] *Wikipedia: [https://en.wikipedia.org/wiki/UIC_wagon_numbers UIC Wagon Numbers]*LTSV Wagons: [https://www.ltsv.com/w_ref_codes_uic.php RIV/UIC Wagon Codes]
