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Last Updated 23-Aug-2002

VR T-class modifications

VR T320 trundles along the main to the siding for its shunting duties for the day.

These are some suggested changes to the T320's engine file to give more prototypical performance. The changed values below are taken from John Cleverdon's Locopage specifications.

As well, rather than using the default GP38 cab, for a more realistic driving experience use a GP7 or GP9 cabview. The T320 & T322 designer, Gavin Mclaughlan, has set them up for long-end driving so a GP38 cabview makes it too easy. A GP7 or GP9 cabview makes the driving experience more realistic by allowing the driver to only see down the right-hand side of the loco (the GP7/GP9 cabviews are set up for U.S. right-hand driving).

Naturally, you'll need Gavin's VR T-class locos, (1.9Mb, 14-Jun-02) from the file library.

At the time of writing (16-Jun-02), the cabview for the GP7 by Sam Spade, (2.6Mb, 17-Nov-01), is being tried here at webTrainSim. Extract the EXE, check for viruses, and run the installer. The GP7 cab is installed in the Common.Cab folder. Note you must also extract corrected CVF files from - full folder paths to the ACE graphic files in the originals weren't completed and these CVFs fix that omission.

Open t320.eng in WordPad as usual, and scroll your way down until you come across the following lines (after the Lighting and Engine Effects sections). Use the values shown in red below:

     Wagon ( t320 )
     Type ( Diesel )
     MaxPower ( 710kw )
     MaxForce ( 169kN )
     MaxContinuousForce ( 125kN )
     MaxVelocity ( 65mph )
     MaxCurrent ( 1000A )

This is not the last word on changing some values for the T-class locos to achieve more realistic performance. At the moment, webTrainSim hasn't reference to detailed documentation on loco and engine specifications so parameters, such as above, are gleaned from some web sites.

There's a small fix to get the throttle working correctly as you notch up or down. This error is due to an oversight of the original developers and was in the default GP38 engine file. Scroll further down t320.eng until you come across the following lines:

     EngineControllers (
           Throttle ( 0 1 0.125 0 0.
                    NumNotches ( 9
                    Notch ( 0       0 Dummy )

The offending piece of code is that 0. at the end of the Throttle line. It's a spurious entry so delete it and you'll have:

     EngineControllers (
           Throttle ( 0 1 0.125 0
                    NumNotches ( 9
                    Notch ( 0       0 Dummy )

By the way, the four values for notch controls, such as above, are:

<min-val> <max-val> <step-val> <default-val>

While you've still got t320.eng opened in WordPad, move back to the start of the file and search for Cabview. Insert the following to use the GP7 cab:

Cabview ( "..\\..\\Common.Cab\\GP7\\gp7-ndb.cvf" )

You can also alias the default GP38 sounds to save disk space. Make these changes to the respective Sound lines in t320.eng:

Sound ( "..\\..\\GP38\\Sound\\GP38eng.sms" ), and,

Sound ( "..\\..\\GP38\\Sound\\GP38Cab.sms" )

Following on from Barry Andrews' work with an inside passenger view accessed with the "5" key (see More GP38-2 cabviews), webTrainSim has commented out the Inside block for the T320 while testing the changed parameters and the GP7 cab. If you want to keep the inside passenger view, then make the changes suggested by Barry in More GP38-2 cabviews.

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