Got a minor graphical confusion I noticed today. The thing is, this train... is no longer decelerating for the sharp corner at the top of that hill, yet the throttle display sits on "some brake" for an entire day after the speed stops descending at 40, meaning the locomotive is clearly generating power against the hill:

Loaded trains don't stop at 40, since they don't have the power to maintain 40 on that hill, but they also indicate braking for an extra second or two (at 1x play speed) after they've already stopped braking. I will also note the "tractive effort" and other parameters, if I mouseover the statistics icon, also suggest it's still braking. Those figures & displays don't settle to start matching likely actual values (positive tractive effort, decreasing as the train clears the hill) until it gets here:

Which is quite a ways.

While the apparently-averaged displays could absolutely be doing that in an effort to avoid generating sporadic, unreadable outputs on an oscillating value, I get the idea that a clearly-inaccurate display lasting this far into the curve wasn't quite intended. You probably don't need the hill for reproduction, just the sharp corner at the end of a high-speed zone.

In case you're wondering, the "Grade Force" line does correctly drop to zero the moment the train clears the grade, rather than 4 car lengths later like the tractive effort figure required to stabilize on actual climb power after the brake. Worth note, the tractive effort field required an extra car length- about a day- after clearing the hill to stabilize on the level-terrain 40km throttle value. Still better than 4 car lengths. Then 3 days later, it slammed to max throttle because the train had cleared the corner as well. In case you're wondering, the curve starts at that one pillar.

Update 4.1 | v0.8.4a (b588)

... I guess I'm trying to outdo your own testing team.

Could you attach your save so that we can reproduce this?

... You need my save? It's a simple graphical glitch, which will happen on any trackage that looks even remotely like this, and where the trains have to decelerate for the corner:

It's most pronounced when the straight is a steep upgrade and the train is fully-loaded (such that it requires a significant amount of pulling power as soon as it enters the corner), but simple elevated rails provide more than enough height.

I would also like to note that the hill on which it was first observed has been demolished weeks ago by this point, so I'm not sure I even have a savefile anymore with that hill. I'm pretty sure this is the only sharp curve left, that's approached at speed- and yes, that hill is just long enough that the trains lack the power to hold a full 40 around the corner until they clear the bottom of the hill. They'll sit at 38 instead.

... You can see from the smoke coming from the engine that it's already gone to producing power, and is probably still increasing power since the tender is significantly lighter than the freight cars, but the dialog still indicates braking.

For future reference, this issue is caused by the smooth function.