General WAG File Settings

Aim - this section provides an overview of some of the more general parameters needed within a WAG file.

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Wagon Steam Heating

General Open Rails Parameters for Wagons


This page describes some of the simpler settings potentially required in the WAG. Some of the more important settings are found on pages purely dedicated to their description.


Wagon Steam Heating

The main purpose of the OR Wagon Steam Heating Model is to "generate" steam usage on steam locomotives, a reduction in the mass of respective vehicles as water and fuel is used, and generate some visual effects in the game. The model was built using information sourced from the articles found on the Wagon Steam Heating Information.

Steam for steam heating of trains can be provided by steam locomotives, diesel locomotives fitted with a steam generator or by separate steam generator wagons.

To enable steam heating to work in open rails the following parameter needs to be included in the engine section of the steam locomotive ENG file:

MaxSteamHeatingPressure( x )
x = maximum steam pressure in the heating pipe - this is generally 40 to 80 psi in UK, but can be as high as 180 to 250 psi in USA

If the above parameter is fitted to the locomotive, then an extra line will appear in the extended "LOCOMOTIVE INFORMATION" HUD to show the temperature in the train, and steam heating pipe pressure, etc. Diesel locomotives should also have the steam generator defined in the wag section of the ENG file.

Steam heating will only work if passenger cars are attached to the locomotive, (or for wagons that have been defined as heated). Warning messages will be displayed if the temperature inside the carriage falls below 45 degF (10 degC).

The player can control the train temperature by using the following controls:
Alt-U - increase steam pipe pressure (and hence train temperature)
Alt-D - decrease steam pipe pressure (and hence train temperature)

The impact of steam heating will vary depending upon the season, length of train, etc.

Some special visual effects can also be implemented as part of carriage heating. These include steam leaks in the steam pipes, and heating boiler exhausts, etc. Further details can be found on the Visual Effects page.

By default steam heating should work with standard defaults already included in OR, however if you wish to customise your configurations, the follwoing parameters are available for this purpose.

Diesel Locomotive

Also in the eng section of the ENG file the MaxSteamHeatingPressure( x ) line must be included.

Diesel locomotives that are fitted with steam heating boilers need to have the following parameters added to the wag section of the ENG file.

ORTSHeatingBoilerWaterTankCapacity ( x ), where x = water tank capacity
ORTSHeatingBoilerWaterUsage ( x1 y1 xn yn ), where x = steam usage rate, y = water usage rate
ORTSHeatingBoilerFuelUsage ( x1 y1 xn yn ), where x = steam usage rate, y = fuel usage rate

For Bristish Railways modellers, this information on steam heating boilers fitted to diesel locomotives, has been compiled to assist in configuration.

Steam Heating Wagon

A "stand alone" car can also be set up with a steam heating boiler for heating the train when hauled by a locomotive not configured for steam heating, using the above paramaters and the followingan example entry for the wag section for this type of wagon is given below:

   ORTSWagonSpecialType ( HeatingBoiler )
Comment ( Heating boiler water capacity 840g-uk sufficient for approx 4 hours )
Comment ( * Spanner Swirlyflo heating boiler produces steam at max 2000lb/h * )

   ORTSHeatingBoilerWaterTankCapacity ( 840g-uk )
   ORTSHeatingBoilerWaterUsage ( 0 0 2000 200 )
   ORTSHeatingBoilerFuelUsage ( 0 0 2000 20.5 )

Similar information can be added to any wagon to convert it into a steam generator.

A small number of British diesel locomotives were fitted with scoops to replenish the boiler water tanks from water troughs. These should be defined in the eng section of the ENG file in the same way as scoops for steam locomotives.


General Open Rails Parameters for Wagons

The general parameters that define the features described on this page are tabulated on the following web page.

General Parameters for WAG and ENG files (updated May 2020)