EMD SD70 Series Physics Modification Pack Release

[FanRailer]

This is the EMD SD70 Series Physics Modification pack for the SD70MAC, SD70ACe, and SD70M-2. In this video, you will see me demonstrate the changes that I've made to the locomotives to make them perform more realistically. The test consists of 3 locomotives of one class accelerating a 60 car Autorack freight train up to 70 MPH before utilizing only dynamic braking to stop.

In order to utilize this freeware physics upgrade, you must have purchased the "SD70 V2 Volume 2 Loco Add-On" pack available at Steam: http://store.steampowered.com/app/208365/

This is a freeware pack; in no way is it to be used for commercial purposes. You are free, however to further modify the physics enhancements found in this pack for personal use if you so choose.

THIS IS NOT A SOUND UPGRADE PACK. Physics adjustments made around the existing sounds.

The purpose of this pack is to adjust the locomotive weight, fuel capacity, motor amperage limits, and traction and braking effort values for more realistic operation.

The pack purchased from Steam includes the BNSF SD70MAC, BNSF SD70ACe, Canadian National SD70M-2, and Norfolk Southern SD70M-2. Originally, all locomotives in this pack shared a single set of operating physics, making them operationally identical in the game. However, we know that these locomotive models differ greatly in real life. This mod pack differentiates those locomotives in the game.

General Parameter Change Log (same for all three locomotive classes):
1. Set fuel tank capacity to 4,900 gallons.
2. Changed HUD ammeter function so that it displays tractive/braking effort in thousands of pounds. This means that if the HUD ammeter reads "157 Amps", the locomotive is putting out 157,000 lbs of tractive effort. Conversely, if the HUD ammeter reads "-34.52 Amps", the locomotive is putting out 34,520 lbs of dynamic braking effort.
3. Adjusted tractive effort ratings and curves for individual locomotive models based on the specifications listed below.
4. Adjusted dynamic brake effort ratings and curves for individual locomotive models based on the specifications listed below.

Specific horsepower and tractive effort ratings used in calculation for individual locomotive models:
1. EMD SD70MAC (EMD 16-710G3B; 4000 GHP)
a. Starting tractive effort of 175,500 lbs (780.663 kN) up to 7.165 mph.
b. Traction horsepower at wheel is 3,350 hp (2,500 kW); efficiency rating of 83.75%.
c. Max Dynamic Brake effort of 81,000 lbs (360.3 kN) from 23.845 mph to 3 mph; linear fade from that speed to 0 lbs @ 1 mph.
d. Dynamic Brake horsepower at wheel is 5,145.6 hp (3,840 kW).
e. Increased weight of 188.3 metric tons (415,126.18 lbs).
f. Maximum speed of 70 mph.
g. Fuel consumption @ notch 8 is 191 gallons per hour.

2. EMD SD70ACe (EMD 16-710G3C-T2; 4500 GHP)
a. Starting tractive effort of 189,000 lbs (840.714 kN) up to 7.646 mph.
b. Traction horsepower at wheel is 4,185 hp (3,123.134 kW); efficiency rating of 93%.
c. Max Dynamic Brake effort of 105,000 lbs (467.063 kN) from 18.395 mph to 3 mph; linear fade from that speed to 0 lbs @ 1 mph.
d. Dynamic Brake horsepower at wheel is 5,145.6 hp (3,840 kW).
e. Increased weight of 191 metric tons (421,078.6 lbs).
f. Maximum speed of 75 mph.
g. Fuel consumption @ notch 8 is 187 gallons per hour.

3. EMD SD70M-2 (EMD 16-710G3C-T2; 4500 GHP)
a. Starting tractive effort of 163,000 lbs (725.06 kN) up to 8.486 mph.
b. Traction horsepower at wheel is 4,050 hp (3,022.389 kW); efficiency rating of 90%.
c. Max Dynamic Brake effort of 86,850 lbs (386.328 kN) from 22.4 mph to 9 mph; extended range sawtooth function between those speeds; linear fade from max brake effort @ 9 mph to 0 lbs @ 3 mph.
d. Dynamic Brake horsepower at wheel is 4,556 hp (3,400 kW).
e. Increased weight of 177 metric tons (390,214.2 lbs).
f. Maximum speed of 75 mph.
g. Fuel consumption @ notch 8 is 187 gallons per hour.

IMPORTANT; Install Instructions

1. Locate the RSC assets folder (C:\Program Files (x86)\Steam\SteamApps\common\RailWorks\Assets\RSC)
2. Open Railworks_EMD_SD70MAC_SD70ACe_&_SD70M-2_Physics_Mod_Pack.rar
2a. Before proceeding to step 3, make sure your "RSC" folder is NOT set to "read only". You can change the folder settings using the properties function. IF the "RSC" folder is read only, the files will not overwrite existing files when you attempt step 3.
3. Drag both file folders ("SD70Pack02" and "SD70Pack03") from the .rar in step 2 into the directory you opened in step 1. Overwrite if asked.
4. The installation should be complete. Run TS2015 to check.

Thank you for downloading and installing.
Enjoy =)

Download link: http://railworksamerica.com/index.php/d ... ccessories

[BNSFdude]

Much needed, thanks!

[FanRailer]

Much needed, thanks!

No problem. It's been a busy week for me lol.

[artimrj]

These have been updated. The files are new as of 8:30 tonight.

[FanRailer]

These have been updated. The files are new as of 8:30 tonight.

Thanks

[krellnut]

I love what this has done for the performance of this loco. I don't honestly know if its working closer to real ones, but so what. In this game, AWESOME!. Going to try the ES stuff right away. Any chance your going to the same for the old SD40? Many, many thanks for your mods.

[BNSFdude]

Just wanted to comment. I experimented a little bit at work just to give you some feedback. I was dynamic braking with a SD70MAC, and it seems to sawtooth as well at the same speeds you showed above. They also develop 1000 lbs of dyn brake effort while in Set-Up. With the 70MAC as well, it was reporting 4300 GHP from the alternator, no figure on the traction horsepower was available through. For AC engines, I'd almost assume a transmission efficiency of 92-93.5% for all of them.

[FanRailer]

Just wanted to comment. I experimented a little bit at work just to give you some feedback. I was dynamic braking with a SD70MAC, and it seems to sawtooth as well at the same speeds you showed above. They also develop 1000 lbs of dyn brake effort while in Set-Up. With the 70MAC as well, it was reporting 4300 GHP from the alternator, no figure on the traction horsepower was available through. For AC engines, I'd almost assume a transmission efficiency of 92-93.5% for all of them.

Interesting info. Considering there isn't a setup position in the SD70MAC for this game, I can't really simulate that. It also seems that the dynamic brake behavior in real life is a direct function of the traction computer programming that goes into the locomotive. Of course the SD70MAC is capable of a flat dynamic brake curve, as seen in this Siemens spec sheet: http://web.archive.org/web/200411141633 ... MAC_EN.pdf

Since I don't have access to internal railroad documents on how their locomotives' traction system is programmed to deliver power to the rails, I chose to go with the available documentation that I do have.

[BNSFdude]

Roger. The saw wave you have on the SD70M-2 is pretty much the same as what is on the BNSF MACs from what I experienced.
Man the 70 sounds suck. This really drives me to collect more recordings at work so Walter and I can accurately represent at least the SD70MAC and the sounds they make. Truly unique.

Sidebar, it so really ticks me off that wheel slip occurs in TS, and you get notification of it through the HUD or the lit indicators. In reality, wheel slip is rarely prolonged for more than a quick slip, as even SD40-2s wheel slip systems quickly detect the dropping of amps on a particular motor, and wind back the field excitation a bit to make it stop slipping, as well as applying sand automatically. The only engine that has got this right is the GP20 thus far.

[FanRailer]

Roger. The saw wave you have on the SD70M-2 is pretty much the same as what is on the BNSF MACs from what I experienced.
Man the 70 sounds suck. This really drives me to collect more recordings at work so Walter and I can accurately represent at least the SD70MAC and the sounds they make. Truly unique.

Sidebar, it so really ticks me off that wheel slip occurs in TS, and you get notification of it through the HUD or the lit indicators. In reality, wheel slip is rarely prolonged for more than a quick slip, as even SD40-2s wheel slip systems quickly detect the dropping of amps on a particular motor, and wind back the field excitation a bit to make it stop slipping, as well as applying sand automatically. The only engine that has got this right is the GP20 thus far.

Yea man, I feel you about the sounds. The wheelslip thing also bugs me... It really screws you over if you're trying to do a career scenario without losing too many points. I feel like there should be a way to code into the game an accurate anti-wheelslip protection software that automatically dials back TE to the adhesion limit, much like wheel creep and whatnot that they have on the EMDs. IDK what GE calls their wheelslip software lol.

Speaking of wheelslip, check out this acceleration test that was run with an ACS-64 @ Pueblo if you haven't seen it already. The engineer really put that wheelslip software to work haha:

[buzz456]

Look at the date of the previous post prior to yours.

[TheTeenageFoamer]

Can we have this thread locked? Just incase other people think that this thread is alive.