The first multi-system TRAXX unit that could operate under AC and DC electrified catenaries, SBB Re484 001, was introduced at the same time "185 561" was introduced as demonstrator locomotive for the F140 AC2 type. In addition to the 15 kV/16.7 Hz and 25 kV/50 Hz AC supplies, the new model could also be operated under 3 kV DC overhead electrification. Later models also supported a 1.5 kV DC supply. This locomotive for SBB was also the first TRAXX variant with individual axle control in place of individual bogie control. The general type name given by Bombardier was TRAXX F140 MS.