[darwins]

ORTSDoesVacuumBrakeCutPower is no longer working when used like this in eng files:

ORTSDoesVacuumBrakeCutPower ( 1 )
ORTSBrakeCutsPowerAtBrakePipePressure ( 12.5inHg )
ORTSBrakeRestoresPowerAtBrakePipePressure ( 16inHg )

Testing suggests that this has not worked in OR versions after U 2021-10-31 0906

This was previously working in diesel and electric locomotives with either standard automatic vacuum brakes such as BR 10203 and EE Deltic and in locomotives with vacuum_EQ brakes such as BR Class 20.

At some stage we should get this parameter working for air brakes as well as vacuum brakes.

ORTSDoesBrakeCutPower ( 1 )
ORTSBrakeCutsPowerAtBrakePipePressure ( 46psi )
ORTSBrakeRestoresPowerAtBrakePipePressure ( 60psi )

[Serana]

I tested with the BR Class 20 and BR 10203. It works as expected on my side.

[darwins]

That is very strange. It still does not work for me. This is using today's unstable version
With the class 20 - release the vacuum brake to 21 in Hg, open the throttle slowly up to 100% and drive

https://i.imgur.com/f73CaA4.jpg
The speed has reached 30 mph and I can see that the power is 723 hp
https://i.imgur.com/NzTNn2N.jpg
Now, without closing the throttle apply the brake sufficiently that the vacuum in the train pipe falls below 12.5 in Hg like this
https://i.imgur.com/i4oFn0Y.jpg

Now the vacuum in the train pipe is reduced below 12.5 in Hg - power should be cut off - there should be 0 hp [what happened in OR until about two months ago] The vacuum in the train pipe is 9 in Hg although the power should now be 0 hp it is still 752 hp

https://i.imgur.com/T4Y5hPq.jpg

[Serana]

Have you looked at the FORCE INFORMATION page ?
On my side, traction force falls backs to 0 correctly.

[darwins]

I still have a force in the forces HuD
https://i.imgur.com/kve13TY.jpg
For some reason you are getting different behaviour to me.

Does the resume work for you also? If you release the brake does the motive force resume when the vacuum brake pipe rises above 16 in Hg?

[Serana]

Yes, it works properly.

[darwins]

So can we find out what is different. How is it working for you but not working for me? Are we both using U2021.11.30-0521? What else could be different?



Could someone else possibly try this and report back here?

[Serana]

Yes, I am using the latest unstable version and the freshly downloaded version of the rolling stock.

Edit : Have you disabled the train control system in the options ?

[darwins]

I did not disable TCS.

Now tried again and it does work if I disable TCS - but it should also work if TCS are enabled.

These locos use TCS - for UK AWS - which in certain circumstances applies the brake. So is it possible to fix so that it works with TCS - which it used to.

[Serana]

You mean you have a TCS script for that locomotive ?

This functionnality is now part of the train control system. If you have a TCS script, you have to implement this functionnality in the TCS script.
For most cases, that means just copying the function UpdateTractionCutOff from the MSTSTrainControlSystem class.
For other cases, you can customize how it works in the script (implementation of this traction braking interlock can be different depending on the country).