Of course the wild card for freight use is, what will a permag-motored freight locomotive cost? This is one of the biggest reasons for Bombardier dominance. The Siemens locomotive was sized a little too powerful, for most freight use. The greater power came with a higher-price tag. I suspect that Siemens would have had even fewer orders, if Bombardier wasn't producing at capacity. The TRAXX 2E variants come from the bodyshell being designed to accomodate the diesel engine variant, mainly the radiator openings. Otherwise there is no significant difference from the TRAXX 2 model. All the F140AC2 (DB Class 185, SBB Re482, etc.) variants still use the TRAXX 2 bodyshell, as DB and Bombardier are unwilling to risk potential homologation problems, from a change in the bodyshell. All Siemens ES64F4 locomotives use IGBTs in their power conversion equipment as do all the ES64U series locomotives (Taurus). Siemens first IGBT locomotive was DB Cargo's 152190 (This locomotive was intended to be 152032). The 152 (and the Alstom Prima I) suffer from poor tracking at speed, resulting in excessive track forces, which is why they never received authorization in Austria, and why the Prima I only has limited approval in Germany and Switzerland. The ES64F4 solved this problem by using an active yaw-damper on the trucks.