@ES64F4 It's basically the same what I said in one of my previous posts.
Would it be even possible to change the ammeter according to the selected voltage in the train simulator? I think (but please correct me if I'm wrong) that those values are hard coded per model and it would only be a visual fix.
Second question is: is the 600 kN really reached with a single engine, or is that a visual issue only? So is there a difference in performance between single and double engine? If there is not, than that is obviously a bug.
I'm afraid that the handling of the +/const/- is a train simulator limit. In reality, the handle will return to the const position automatically. From what I understand, creating that in train simulator is possible, but only with one 'resting' position. The Traxx has 4 of those in a single handle: EB const, 0, T const and T max.
The 300 kN AFB limit is a bit of an issue. As you said, it is a regulatory issue, not a technical one. @ChrisTrains has obviously chosen to implement it hard coded. Maybe he could remove it in a future update?
A bit more in depth detail about that 300 kN and the AFB:
the 7J software that has been in use for the Intercity Direct trains was never built for a 'sandwich' consist (engine - coaches - engine). The traction distribution on both engines is simply 50/50, which would be right for a double headed train.
With that sandwich consist, it is a bit of a problem, as the rear engine could push the coaches from the tracks, with a quite higher risk when the front engine would suddenly stop working (for whatever reason).
For that reason, the maximum allowed tractive effort is 150 kN for the rear engine, which automatically limits the front engine to 150 kN too. And there you have the 300 kN power limit.
This is fixed in the new 9.4 software, that is currently being rolled-out on the NS Traxx engines. They have a special Sandwich mode, which distributes the traction as 66/33 when accelerating and the other way around (33/66) when using the EB brake. That way, it is no longer an issue and the 150 kN limit on the rear engine is also automatically enforced.