see: UTP Marking 2015, Uniform Technical Prescription Applicable to Vehicle Numbers and linked alphabetical marking on the
bodywork: THE RAILWAY VEHICLE MARKING, Applicable from 1.1.2015, retrieved from: OTIF page Prescriptions and Other Rules
uic.org
Leaflet 419-2, Analytical numbering of international freight trains, Obligatory, 2nd edition, November 2008 - Translation, 1/09 (issued 1/02/2009), ISBN978-2-7461-1957-4
