[Jean-Paul]

Hi !
Here's the job ! It works as well as possible. I let you change the names and references of files, because I've used the first SD40-2 repaint which was available on my computer (repaint SLI). So, usual sequence of notches is modified, taking in account the real parameters of the engine (0 - 0.05 - 0.15 - 0.25 - 0.375 - 0.5 - 0.65 - 0.8 - 1.00 , instead of the common 0 - 0.125 - 0.250, etc...). So, I add MSTS .eng with this modification. In my case, I've also slightly modified .sms files to take in account the new repartition of notches. Cabview (SLI origin) was not modified, because not showing throttle !
I've tested on Cheyenne with a 1500 t hoppers, without any problem. Effective yield of "electric transmission" is around 80-90 %, depending on notch and speed. It seems to be quite realistic. Of course, this yield is very low at start, what is absolutely normal, considering that power (at rail) = Effort*Speed, and when speed is around zero, power...also !! But it increases with speed, of course !! :derisive:
By reading include, you'll see I've taken in account the "discontinuities" of real curves, even if it's not necessarly evident when cruising ! Dynamic brakes has been also treated.
So, I let you test !! Have a nice trip !
Cheers,
Jean-Paul

[Jean-Paul]

Sorry, my zip didn't start with the text...
I re-do !!
JP

Attached File(s)

•  SD40-2 ElvasT.zip (5.72K)
  Number of downloads: 296

[engmod]

I am going to explore the Open Rails manual to do with "OR-Specific Include Files for Modifying MSTS File Parameters"
I am using "Open Rails Manual, Release x.3997 (draft)" dated 27 July 2018.

I draw your attention to Page 121.

The Maximum Tractive Effort is given as 185000 Newtons ( 41325 lbf ).
I have been using 139,000 lbs as the weight/mass

these figures appear to be taken from www.thedieselshop.us and I believe where the problem started.

The figures that I use for a ge70tonner are:-

weight 139,000 lbs
MTE 119,000 newtons, 26775 lbf
CTE 75,000 newtons, 16775 lbf

If we use the 2 MTU's like this:-

119000
185000 X 100 we get 64%

I believe this is very close to the error that comes from the HUD when using tractiveforcecurves.

If anybody has any better figures, please post them.

[superheatedsteam]

There are a number of locomotive manuals that have specs, available from the Fallen Flags web site.

http://www.rr-fallen...ual/manual.html

Cheers,

Marek.