In September 2003, Bombardier gave the Class 185 family a brand name, TRAXX, intended to allude to the terms 'traction', 'track' and 'attraction'. The acronym stands for "Transnational Railway Applications with eXtreme fleXibility". The first letter of TRAXX type designations provides for differentiation according to the area of application, with "F" for freight and "P" for passenger. The original system also tentatively included "H" for heavy-haul and "S" for high-speed, but no actual vehicles were delivered under this designation. The number following the first letter indicates the top speed of the locomotive in kilometers per hour. The next two letters indicate the supply system, with "AC" for alternating current electric locomotives, "DC" for direct current electric locomotives, "MS" for multi-system locomotives capable of operating both under AC and DC overhead wires, and "DE" was foreseen from the start for an eventual Diesel-electric version. An extra "P" letter at the end was to designate powerheads (traction heads), that is locomotives with one driving cabin for push-pull operation. An also optional number at the end designates different versions, later used for the designation of generations.