One wagon tilting the wrong way...

[chrisell]

I'm doing my proof of concept for my next project - a Stadler GTW. It's a DMU with two passenger wagons that hook to a central power wagon.
I've go everything working in my sample, but I've got an odd behaviour that I don't understand - the power wagon is "leaning in" to the corners when the consist moves. See the screenshot below.
If I stop the train in a corner, the tilt becomes far less pronounced, but it's still there.
I know from experimenting that this has nothing to do with the couplings. My suspicion is that it's something to do with the fact that's an extremely short wagon, but I don't know why that would make any difference.
Note : I'm not trying to make a tilting train - this is just a regular wagon blueprint.
Any ideas would be appreciated.

[JasVick]

I know this may sound silly but - is the wagon "flipped" in the consist and not re-setting co-ords correctly (ie producing a mirror image) so that it acts in the opposite direction?

[chrisell]

I know this may sound silly but - is the wagon "flipped" in the consist and not re-setting co-ords correctly (ie producing a mirror image) so that it acts in the opposite direction?

I thought of that and tried flipping it around, resetting the coordinates etc. No avail

[Juanillo99]

Have you tried to change the different values ​​of the couplings in the blueprint - Damping, SpringCoefficient, Strenght, MaxForce, etc?
Maybe I said silly, but it does not hurt to try.

[MaikG]

You need to bring the shorter wagon to the same physics behavior like the other two. Means that you should set the center of gravity to a higher value and the mass and ease of derailment also. The effekt i see in your picture is that the two outer wagons are leaning more out of the curve because of more centrifugal force to the sides than the shorter wagon has. So you have to bring all the values to a consistent behavior. But you will not get a perfect result on that.

[chrisell]

You need to bring the shorter wagon to the same physics behavior like the other two. Means that you should set the center of gravity to a higher value and the mass and ease of derailment also. The effekt i see in your picture is that the two outer wagons are leaning more out of the curve because of more centrifugal force to the sides than the shorter wagon has. So you have to bring all the values to a consistent behavior. But you will not get a perfect result on that.

Gold star!
Thanks - the middle coach has it's "ease of derailment" set much lower than the outer two (no idea why). I set it the same and now it's all behaving like I would expect.
Also - for future googlers : this wiki page explains how "ease of derailment" affects center of gravity in Railworks :
http://www.railsimdownloads.com/wiki/ti ... e%20Manual