Open Rails NewYear MG Version 67, Physics Changed?

[meeshu]

Running test trains (under NEC V4 route), I've noticed that while running under MG version 67, it is harder to start/accelerate train compared to other versions of Open Rails (1.3.1, and unstable dated 8th July).

To get my test train accelerating, it requires throttle "3" setting under MG version 67. For other versions of Open Rails, it just requires throttle "1" setting to get my train to accelerate.

So, have the "physics" been modified in MG version 67 (by mistake)?

Here is the test consist -

4_dda40x_MP_empty_tankers.zip

The locomotives are from here. Although any DDA40X locomotive could be used instead.

The tanker cars are from here.

[meeshu]

On testing with different versions of OR MG that I've downloaded, the last version (that I have) which allows train acceleration in throttle "1" is version 63.

The next version (that I have) of OR MG that doesn't accelerate the train until the throttle is in position "3", is version 66.1.

So after version 63, there appears to have been some changes to train (acceleration) physics. Whether these changes are intentional (or not) and realistic is unknown?

[trainmanaustin]

Depending on length of the train and tonnage, I would say having to notch the throttle to 3 is realistic to get moving.

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[rman]

Hey, sorry for the bug - as you've deduced, the starting friction is an order of magnitude higher than it should be, because I made a mistake when merging in the new starting friction property. A fix is ready to go but hasn't yet been merged into the master branch. I believe it should reach the next NewYear MG release.

[meeshu]

Thanks for the comments!

I was wondering whether the physics were wrong to begin with, and the physics were corrected in later releases!?

[csantucci]

OR NewYear MG rev. 68 should include Ryan's patch.

[meeshu]

Thank you!

[trainmanaustin]

Issue is resolved in rev. 68.

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[meeshu]

I can also confirm that my test train again accelerates using throttle "1".

Thanks again for the correction!