BrakeControllers

Aim - this section describes some common brake control positions, and how they can be modeled within the Open Rails ENG file.

The BrakeControllers are used to model the valve positions on typical train or locomotive (engine) brake controllers.

For more information on the types of control valves used by each brake system refer to here.

Index

Introduction

A-6-ET (Engine and Tender) Brake Control

A-7-EL Brake Control

26-L Brake Control

24-RL Brake Control

Useful Links


Introduction

Over the years various brake systems have been developed. To control these brake systems various brake control valves were used to allow the locomotive driver to control the operation of the brakes. Older brakes tended to use air valves, whereas more modern systems have electrical (electronic) switches. The control valves or switches had multiple positions which allowed the driver to release or apply the brake under different scenarios. For more information on the types of control valves used by each brake system refer to here.

Open Rails attempts to emmulate the operation of these valves or switches by providing a number of brake control tokens which can be defined in the ENG file. Each of these tokens may have a different function associated with them, and therefore the user should use the relevant tokens for the brake control being modelled. The order of the tokens when defined in the ENG file should be maintaind in the same sequence as the tokens are designed to operate. Out of sequence tokens may create incorrect brake control operations.

This page shows the brake control token that are thought to be used currently by Open Rails to define each of the relevant brake controller types. This is currently a work in progress, so any relevant feedback is welcomed through the contact page.

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A-6-ET (Engine and Tender) Brake Control

This type of brake system was typically fitted to steam locomotives and their tenders.

Automatic Brake Valve Controller () (Train Brake)
Brake Valve Position State OR BrakeContoller Type
Release Brake releases. TrainBrakesControllerReleaseStart
Running Maintains pressure in train brake pipe as set by Equalising Reservoir pressure. TrainBrakesControllerRunningStart
Lap (or Neutral) Causes a minimum service pressure reduction (typically 6-8 psi) when moved from the running to the Lap position, then allows brake pipe pressure to decrease due to train pipe leakage. TrainBrakesControllerHoldLappedStart
Service Produces a gradual reduction in train brake pipe pressure. TrainBrakesControllerFullServiceStart
Emergency Emergency application of brakes. TrainBrakesControllerEmergencyStart
Independent Brake Valve Controller () (Engine Brake)
Brake Valve Position

State

OR BrakeContoller Type
Release Releases locomotive brake regardless of train brake setting. EngineBrakesControllerFullQuickReleaseStart
Running Allows the train brake to control the engine brake. This is the normal brake position when the train is running. EngineBrakesControllerRunningStart
Lap (or Neutral) Holds the brake pressure at the pressure set by other positions. EngineBrakesControllerHoldLappedStart
Slow Application Allows a slow application of the brake. EngineBrakesControllerFullServiceStart
Fast Application Allows a fast application of the brake. EngineBrakesControllerEmergencyStart

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A-7-EL Brake Control

This brake system was very similar to the A-6 described above, but was designed for diesel or electric locomotives. It could support removal of brake handles to allow changing ends on the locomotive, regenerative (dynamic) braking could be added if required, and the main air hoses, such as the main reservoir were interconnected between locomotive to more easily support multiple heading.

Automatic Brake Valve Controller () (Train Brake)
Brake Valve Position State OR BrakeContoller Type
Release Brake releases. TrainBrakesControllerReleaseStart
Running Maintains pressure in train brake pipe as set by Equalising Reservoir pressure. TrainBrakesControllerRunningStart
Lap (or Neutral) Causes a minimum service pressure reduction (approx 6-8 psi) when moved from the running to the Lap position, then allows brake pipe pressure to decrease due to train pipe leakage. TrainBrakesControllerHoldLappedStart
Service Produces a gradual reduction in train brake pipe pressure. TrainBrakesControllerFullServiceStart
Emergency Emergency application of brakes. TrainBrakesControllerEmergencyStart
Independent Brake Valve Controller () (Engine Brake)
Brake Valve Position

State

OR BrakeContoller Type
Release Releases locomotive brake regardless of train brake setting. EngineBrakesControllerFullQuickReleaseStart
Running Allows the train brake to control the engine brake. This is the normal brake position when the train is running. EngineBrakesControllerRunningStart
Lap (or Neutral) Holds the brake pressure at the pressure set by other positions. EngineBrakesControllerHoldLappedStart
Slow Application Allows a slow application of the brake. EngineBrakesControllerFullServiceStart
Fast Application Allows a fast application of the brake. EngineBrakesControllerEmergencyStart

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26-L Brake Control

Note - The following brake control valve settings are currently proposed only, and have not been tested. Feedback upon their sutability and effectiveness is welcomed through the contact page.

Automatic Brake Valve Controller () (Train Brake)

Brake Valve Position

State

OR BrakeContoller Type

Release

Brake releases.

TrainBrakesControllerReleaseStart

Minimum Reduction

With the handle moved to this position, a 6-8 pound brake pipe reduction is made and minimum braking effort is obtained.

TrainBrakesControllerMinimalReductionStart

Full Service

Full braking effect applied - graduated from Minimum Reduction to Full Service

TrainBrakesControllerFullServiceStart

Suppression

As with the handle in the full service position, it will also recover a penalty brake application

TrainBrakesControllerSuppressionStart

Handle Off

This is the position in which the handle must be placed on trailing units of a multiple-unit locomotive or on locomotives being towed 'dead' in a train.

TrainBrakesControllerNeutralHandleOffStart

Emergency

It is the position that can be used to make a 'desired' emergency brake application. This position must be used to reset either a 'desired' or 'undesired' brake application.

TrainBrakesControllerEmergencyStart

Independent Brake Valve Controller () (Engine Brake)

Brake Valve Position

State

OR BrakeContoller Type

Release / Full Application

Brake releases.

EngineBrakesControllerFullQuickReleaseStart

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24-RL Brake Control

Note - The following brake control valve settings are currently proposed only, and have not been tested. Feedback upon their sutability and effectiveness is welcomed through the contact page.

Automatic Brake Valve Controller () (Train Brake)

Brake Valve Position

State

OR BrakeContoller Type

Release

Brake releases.

TrainBrakesControllerReleaseStart

Running

Normal position when train running pressure remains as per set.

TrainBrakesControllerRunningStart

First Service

Applied a minimum service reduction of 6-8 psi.

TrainBrakesControllerMinimalReductionStart

Lap

Holds train brake pipe pressure at set value. It is self-lapping, ie it compensates for train pipe leakage.

TrainBrakesControllerGraduatedSelfLapLimitedStart

Service

Slowly decreases the train brake pipe pressure.

TrainBrakesControllerContinuousServiceStart

Emergency

Applies an emergency brake application

TrainBrakesControllerEmergencyStart

Independent Brake Valve Controller () (Engine Brake)

Brake Valve Position

State

OR BrakeContoller Type

Locking

Brake disabled, uses train brake.

EngineBrakesControllerNeutralhandleOffStart

Release / Full Application

Brake releases.

EngineBrakesControllerFullQuickReleaseStart

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Sample Coupler Code

Typically the lines shown in red text are the only ones that would need to be changed on individual wagons.

Comment ( ************************* Engine Controls ******************************* )

Brake_Train ( 0 1 0.01 0.25(
NumNotches ( 5
Notch( 0.0 0 TrainBrakesControllerReleaseStart )
Notch( 0.25 0 TrainBrakesControllerRunningStart )
Notch( 0.50 0 TrainBrakesControllerHoldStart )
Notch( 0.75 0 TrainBrakesControllerFullServiceStart )
Notch( 1.0 0 TrainBrakesControllerEmergencyStart )
)

Brake_Engine ( 0 1 0.01 0.25(
NumNotches ( 5
Notch( 0.0 0 EngineBrakesControllerReleaseStart )
Notch( 0.25 0 EngineBrakesControllerRunningStart )
Notch( 0.50 0 EngineBrakesControllerHoldStart )
Notch( 0.75 0 EngineBrakesControllerFullServiceStart )
Notch( 1.0 0 EngineBrakesControllerEmergencyStart )
)

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Useful Links

24-RL Locomotive Brake Equipment

26-L Locomotive Brake Equipment

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