Slack play during descent.

[grandafam1]

Due to braking mismanagement I found myself in quite an oscillation, 5 - 6 mph over the course of 1 second seems a little excessive considering the mass of a locomotive.

I left my hands off all controls and just observed the oscillation as it continued for miles. On the constant 1.5% grade, leaving all controls constant, the oscillations should reduce in amplitude over time. They just continued for 10 minutes until I stopped the sim.

Is this an example of Unreal Engine physics, or has the developer made their own physics world for these trains to play in?

[grandafam1]

As strange as it may seem, it appears this behavior is exactly as shorter trains (pre-DPU) behaved when allowed to get out of control.

I found a Ewetube video last night with an actual engineer describing exactly what I experienced in TSW2. He said he could hear the wave of cars banging into each other behind him knowing that at any time the huge lunge forward in speed would arrive at the front of the train, almost knocking him off his feet.

https://youtu.be/M-qcceKuh84

I suspected something similar so, during descent, I was often referring to the F3 Drone view to try to catch the wave as it arrived at the last grain car. I did manage to catch one cycle of the wave impacting the back of the train, then 10 seconds or so later it would re-arrive at the front end.

I will experiment further since I didn't manage to witness any dropping off of the amplitude of the wave as I continued the run without braking inputs.