Open Rails Diesel Parameters for Advanced Modellers

Aim - this section describes the "advanced" settings for diesel related parameters in Open Rails (OR) ENG files.

NB: These parameters are intended for advanced modellers who have an understanding of the information required, and have access to appropriate information.

If you wish to provide any feedback on this page, please use the contact page. It would br great to have some feedback as this helps to ensure the accuracy of the information and models.

Index

Tractive Force Curves

Curtius - Kniffler Formula

Moment of Inertia


Tractive Force Curves

Allows the content modeller to input actual tractive force curves for the locomotive.

Open Rails Use

Open Rails uses a standard default set of values for all diesel and electric locomotives, and the defaults should suit most content modellers.

However, if a modeller wants to customise these values to specific values the following parameter statement should be added to the ENG file.

ORTSMaxTractiveForceCurves( a (x1 y1 x2 y2 .................. xn yn))

Where:
a = throttle setting (between 0 and 1)
x = speed (m/s)
y = Tractive Force (N)

Any number of value pairs can be used, as long as there are more than two pairs, and the info is always in pairs.

As an example, the current Open Rails default values would look like the following statement, if entered through the ENG file:

ORTSMaxTractiveForceCurves(
0 (     0 0     4.67 0     6.66 0    8.88 0     13.32 0     17.76 0     22.22 0     26.64 0     31.08 0     35.52 0     39.96 0     )

1 (     0 222400    4.67 222400     6.66 168134     8.88 129436     13.32 88515     17.76 65385     22.22 50707     26.64 43145     31.08 37363     35.52 28467     39.96 22240 )
)

top


Curtius - Kniffler Formula

Allows the content modeller to input actual curves for the locomotive adhesion.

Open Rails Use

Open Rails uses a standard default set of values for all diesel and electric locomotives, and the defaults should suit most content modellers.

However, if a modeller wants to customise these values to specific values the following parameter statement should be added to the ENG file.

ORTSCurtius_Kniffler ( A B C D )

Where:
A =
B =
C =
D =

As an example, the current Open Rails default values would look like the following statement, if entered through the ENG file:

ORTSCurtius_Kniffler ( 6.18 44 0.161 0.7 )

top


Moment of Inertia

Allows the content modeller to input actual values for the locomotive moment of inertia.

Open Rails Use

Open Rails uses a standard default set of values for all diesel and electric locomotives, and the defaults should suit most content modellers.

However, if a modeller wants to customise these values to specific values the following parameter statement should be added to the ENG file.

ORTSInertia( x )

Where:
x = moment of inertia (kgm^2)

As an example, the current Open Rails default values would look like the following statement, if entered through the ENG file:

ORTSInertia( 7287 )

top