[Stijn D.C.]

Hello,


Today i was testing a Eurostar TMST ( Class 373 )


This train have 2 engined coaches (first bogie only) after locomotives.


Before Rev 167 i was use always "AirBrakesCompressorRestartPressure ( -7.5bar )" on .eng file

Today i was do testdrive and see always when compressor restart there comes a special token on F5 Hud:

 Open Rails NewYear MG 2025-10-02 06-30-39.jpg (1.45MB)
Number of downloads: 7


On that moment i use this commands on R1 & R18 engined coach:

	AirBrakesAirCompressorPowerRating 					( 0 )
	AirBrakesAirCompressorWattage 						( 0 )
	AirBrakesAirUsedPerPoundsOfBrakePipePressure 				( 0 )
	AirBrakesCompressorRestartPressure 					( -7.5bar )
	AirBrakesHasLowPressureTest 						( 0 )
	AirBrakesIsCompressorElectricOrMechanical 				( 0 )
	AirBrakesMainMaxAirPressure	 					( 0.0bar )
	AirBrakesMainResVolume 							( 0l )
    AirBrakeMaxMainResPipePressure                  			        ( 0.0bar )

	ORTSCompressorIsMuControlled						( 0 )

If i do a test with:

	AirBrakesAirCompressorPowerRating 					( 0 )
	AirBrakesAirCompressorWattage 						( 0 )
	AirBrakesAirUsedPerPoundsOfBrakePipePressure 				( 0 )
	AirBrakesCompressorRestartPressure 					( -7.5bar )
	AirBrakesHasLowPressureTest 						( 0 )
	AirBrakesIsCompressorElectricOrMechanical 				( 0 )
	AirBrakesMainMaxAirPressure	 					( 0.0bar )
	AirBrakesMainResVolume 							( 77l )
    AirBrakeMaxMainResPipePressure                  			        ( 0.0bar )

	ORTSCompressorIsMuControlled						( 0 )

Than i get no strange token on HUD data, but al compressors gonna work, so that - befor 7.5bar, dont work anymore.

- before this value was in the past a solution for steeringcars, and engined wagons like this.

And now i use 77Liters, and that makes that mainres is quick full (not okay)


So if i dont give a value above zero on AirBrakesMainResVolume it gives problems and special token/character on HUD display.

For steeringcars and engined wagons without compressor is this a problem.


Greetz,

Stijn

[Stijn D.C.]

Hello,


For have no problems i use now 77l on .eng of engined coaches.


But also if pressure of leading locomotive is under 7,5 bar, compressor of engine1 + engined coach works..


Compressor of engine on back of train go only when mainres is under 7,5bar

 Open Rails NewYear MG 2025-10-03 03-31-16.jpg (1.83MB)
Number of downloads: 4

So i try to use ORTSCompressorIsMuControlled ( 1 ), make no difference.

And if a give more emergencybrakes after eachother and play with brakehoses en release brakpipe every times full, for testing. Than on compressor on backengine works...

Also that engined coach.


 Open Rails NewYear MG 2025-10-03 03-31-19.jpg (1.83MB)
Number of downloads: 3


So the - before number of AirBrakesCompressorRestartPressure dont work anymore.

And ORTSCompressorIsMuControlled ( 0 ) dont do anything in my case.

[abschlammventil]

I'm not sure if I understand your problem correctly, but it should be possible to define engines and cab/control cars without air compressors and/or main reservoirs. Just delete all compressor and main reservoir parameters from the eng file (AirBrakesAirCompressorPowerRating, AirBrakesAirCompressorWattage, AirBrakesCompressorRestartPressure, AirBrakesMainMaxAirPressure, AirBrakesMainResVolume...).

Also: Shouldn't the "AirBrakeMaxMainResPipePressure " be set to 10bar instead of 0bar? Same for "AirBrakesMainMaxAirPressure" for engines with a main reservoir.

I believe "ORTSCompressorIsMuControlled" only works for engines that are directly coupled together - not sure though...

[darwins]

ORTSCompressorIsMuControlled works for power cars at the ends of multiple unit trains that have trailer cars in between. It may (like myself) be confused by negative numbers!

[Stijn D.C.]

Hello,


When i remove all compressor data, engine, trainbrake, controllers, like a .wag file i get this, when compressor start:


 Open Rails NewYear MG 2025-10-03 07-16-24.jpg (1.77MB)
Number of downloads: 3


On Rev 162. this was not happend.

[Stijn D.C.]

 darwins, on 03 October 2025 - 10:28 AM, said:

ORTSCompressorIsMuControlled works for power cars at the ends of multiple unit trains that have trailer cars in between. It may (like myself) be confused by negative numbers!

In case ORTSCompressorIsMuControlled, that is what i thouth too, but for moment there is something not okay.


And that negative numbers is becauze there is for this moment no other solution for engined wagons like this.


For steeringwagons place - on compressor restartpressure was only solution for compressor not let run, becauze steeringwagons have no compressor.

[Stijn D.C.]

Hello,

Update:


With this, it seems be okay:


On .eng of coaches:

AirBrakesAirCompressorPowerRating ( 0 )
AirBrakesAirCompressorWattage ( 0 )
AirBrakesAirUsedPerPoundsOfBrakePipePressure ( 0 )
AirBrakesCompressorRestartPressure ( 0.0bar )
AirBrakesHasLowPressureTest ( 0 )
AirBrakesIsCompressorElectricOrMechanical ( 0 )
AirBrakesMainMaxAirPressure ( 0.0bar )
AirBrakesMainMinResAirPressure ( 0 )
AirBrakesMainResVolume ( 0l )
AirBrakeMaxMainResPipePressure ( 0 )

ORTSCompressorIsMuControlled ( 0 )

On .eng of locomotives:

AirBrakesAirCompressorWattage ( 15500 )
AirBrakesCompressorRestartPressure ( 7.5bar )
AirBrakesHasLowPressureTest ( 1 )
AirBrakesIsCompressorElectricOrMechanical ( 0 )
AirBrakesMainMaxAirPressure ( 9.0bar )
AirBrakesMainResVolume ( 1000l )
AirBrakeMaxMainResPipePressure ( 10.0bar )

ORTSCompressorIsMuControlled ( 1 )

Now MU controlled function works.

Also if forgot to said, that locomotives have powersupply script for TGV. If panto selector is on "L" (local) compressor of engine2 not work.

First the R1 & R18 have get this same powersupply too, for moment i have leave/delete scriptlinking on .eng of engines coaches.

This engined coaches need a independent powersupply or easyone, but not same as locomotives with cabine and pantographs. (roofconnection).


The powersupply scripts are designed for a TGV trainset with locomotive + 8 unpowered coaches + locmotives, but that TMST Eurostar is a special one.


Sorry for this confusion :-(