ORTS Standard Engine Files

**derekmorton** · 04-16-2019, 21:38

A big thanks, Gerry

**scottb613** · 04-17-2019, 04:58

Hi Gerry,

Nice work - sir - thanks... Quite the body of work...

I've been staring at ORTS steam physics files for so long - these look all Greek to me...

First gen is typically about as new as I go - I'll have to try them out on some of the L&N RS3's on the Cumberland which I haven't run in a while...

Regards,
Scott

**longiron** · 04-17-2019, 06:30

A huge thanks. This is a tremendous step in moving the Open Rails community to a common set of diesel physics. This is fundamental for consistent activities, timetables and a lot of other things.

**qballbandit** · 04-17-2019, 08:50

Thanks Gerry!

**Vince** · 04-17-2019, 10:56

Hi Gerry,

Thanks so much for this. I missed this thread before releasing the PRR East. Doggone! The E7 seemed to me at the time that the physics that could be better but I missed the opportunity to fix.
I did try to improve the smoke and was almost successful. The result was better that the pile-of-burning-tires smoke that it emitted at any power setting but still may need improvement.

Do you have any suggestions for the K4 Pacifics? They seem a bit anemic pulling the grade and I seem to remember they ran quite well in MSTS but using that for comparison is not to be trusted.
Thanks again Gerry.

Regards,
vince

**scottb613** · 04-17-2019, 11:43

Originally posted by Vince

Hi Gerry,

Do you have any suggestions for the K4 Pacifics? They seem a bit anemic pulling the grade and I seem to remember they ran quite well in MSTS but using that for comparison is not to be trusted.
Thanks again Gerry.

Regards,
vince

Hi Vince,

The Steam Physics model has been GREATLY simplified for ORTS - most of your MSTS ENG file can be pruned away and discarded...

Here are the only values that I suspect deal directly with "Tractive Effort" in ORTS...

Code:

Comment ( ########## ENGINE SECTION ########## )
        WheelRadius ( 0.775m )

Comment ( ##### ORTS BOILER  ##### )
        MaxBoilerPressure ( 220psi )

Comment ( ##### ORTS CYLINDER ##### )
        NumCylinders ( 2 )
        CylinderDiameter ( 27in )       
        CylinderStroke ( 32in ) 
        ORTSCylinderEfficiencyRate ( 1.0 )

Just go to "steamlocomotive.com" and look up your locomotive of interest and transfer the parameters...

If you want to address more of the values to really make it ORTS compliant - I think I have a pretty good handle on it - be happy to help you and show you the way...

I can also send you my ENG file from a project steam locomotive - that has been setup strictly for ORTS with only the needed parameters as a model...

Regards,
Scott

**cjakeman** · 04-17-2019, 11:54

Hi Gerry,

Originally posted by R. Steele

I'm getting ready to upload 163 Open Rails standard engine files.

Terrific.

If you let me know once they're uploaded, I'll add this as a news item on www.openrails.org

**bobwdude** · 04-17-2019, 15:18

Thank you for all of your work and dedication. That's a massive list of equipment you have there!

**steamer_ctn** · 04-18-2019, 01:25

Hi Vince,

Originally posted by Vince

Do you have any suggestions for the K4 Pacifics? They seem a bit anemic pulling the grade and I seem to remember they ran quite well in MSTS but using that for comparison is not to be trusted.

Is this the PRR K4 steam locomotive?

If so I would be interested in assisting you to work through the ENG file and build a file based upon a reasonable set of physics.

Please PM if you are interested.

Thanks

**=FI=Ghost** · 04-18-2019, 03:34

Very nice, mate! Thank you for all the work.

**scottb613** · 04-18-2019, 04:50

Hi Vince,

Well now you've got the guy who wrote the book on ORTS Steam Physics interested - lol - I'll bow out and yield the floor - best of luck to both of you... Maybe both Ron's Pacific and Decapod could be updated for ORTS - I think many still use both today - at least I do...

Regards,
Scott

**baldwin** · 04-18-2019, 14:11

Originally posted by Vince

Do you have any suggestions for the K4 Pacifics? They seem a bit anemic pulling the grade and I seem to remember they ran quite well in MSTS but using that for comparison is not to be trusted.

The MSTS steam eng file while it works in OR is pretty basic. The additional parameters available in OR will transform the K4 Pacifics into pretty good performers. I highly recommend collaborating with steamer_ctn as he is the person who wrote the current set of steam code.

**trainmanaustin** · 04-19-2019, 15:54

Will these .eng files work on any locomotives including non-orts?

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**R. Steele** · 04-19-2019, 17:00

Originally posted by trainmanaustin

Will these .eng files work on any locomotives including non-orts?

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Open Rails only, they are intended to be used as include files...include files are used to modify MSTS default content, without changing the original MSTS file, to Open Rails physics. Please see Sec. 8.16 in the OR Manual.