https://store.steampowered.com/app/277752/Train_Simulator_Miami__West_Palm_Beach_Route_AddOn/
You can download this pack here:
http://www.mediafire.com/file/4erp955kdqa6rak/Miami_P42DC_Sound_and_HEP_Upgrade.zip/file
(It should become available here once I'm able to contact the administrator)
See it working right here:
https://www.youtube.com/watch?v=AKK3et6Gukw

The default audio sounds nothing like a P42DC. I'm not a computer programmer, so I had to work within the limitations of the game. However, these sounds are from actual recordings:
- GE 7FDL-16 prime mover in normal mode (200-1047 RPM) and HEP mode (900-908 RPM).
The sound is directly linked to the RPM. So, for the HEP engines I gave it 1 RPM per throttle notch. That way you can hear the change in sound according to the throttle position. As you give it more power, the rhythm/beat of the engine stays the same like in real life (900 RPM regardless of throttle notch). But, the base sound becomes more powerful and the engine sounds more "grouchy". Also when you have non-HEP and HEP engines combined, the sound from the HEP engines will overpower the much quieter non-HEP engines. That is until the non-HEP engines surpass 900 RPM (notch 7 & 8). Then, they become KING!
Ignition and shutdown sequence.
The ignition sequence is from a P42DC that idles at 200 RPM, which works fine for the non-HEP engines. But, because of the way the audio program works I was forced to modify the ignition sequence of the HEP engines. So, they take 2 minutes, 10 seconds to reach 900 RPM (Anything faster and the engine sound will overlap badly over the startup sound).
Compressor sounds.
Sorry, no "whoop" sound. The audio program only allows for the "compressor running" and "compressor stop" sounds.
Amtrak K5LA Horn and Horn Sequencer.
SPEAKER ALERT: This is not the typical “bystander” recording of a P42DC passing by. The sound was recorded up close to the horn assembly itself, so it's REALLY, REALLY LOUD.
HEP Implementation:
You have the option to have a HEP engine with or without driver. I adjusted the performance according to the power demands of a “typical” Viewliner long-distance consist.
I couldn’t find the exact power consumption for each type of car. So, I used estimates based on this web page:
http://www.nwrail.com/HEP_config.html
Viewliner Consist:
- 4 Amfleet II Coach Class (160 kW)
+1 Amfleet II Café Lounge (50 kW)
+1 Heritage Diner Car (100 kW)
+3 Viewliner Sleepers (150 kW)
+1 Heritage Baggage Car (1 kW)
= 461 kW
Engine performance with a HEP load of 461 kW:
Horsepower – Kilowatt Conversion: 1 hp = 0.746 kW
461 ÷ 0.746 = 618
This means it takes 618 hp to produce 461 kW of electricity.
3655 hp - 618 hp = 3037 hp
This means that with a HEP load of 461 kW, the locomotive has 3037 hp available for traction.
I also adjusted the locomotive’s tractive effort due to the reduced horsepower. Just like Train Simulator itself, it might not be 100% accurate, but this is as close as I could get.
Non-HEP Engine Installation:
- 1. Using File Explorer, go to the folder located here:
C:\Program Files (x86)\Steam\steamapps\common\RailWorks\Assets\DTG\Miami
2. Drop the Audio and RailVehicles folders from this pack into the folder you just opened.
HEP Engine Installation:
- 1. Using 7-Zip File Manager, open the P42Pack01Assets.ap file.
2. Inside the P42Pack01Assets.ap file, go RailVehicles\Diesel\P42DC\Amtrak.
3. Open the RailVehicles folder you just dropped and go to Diesel\P42DC\Amtrak HEP.
4. Drop the CabView folder from the P42Pack01Assets.ap file into the Amtrak HEP folder from step 3.
5. Inside the Amtrak HEP folder open the Locomotive folder.
6. In the P42Pack01Assets.ap file open the Locomotive folder inside the Amtrak folder.
7. Drop the P42_Engine.GeoPcDx file into the Locomotive folder from step 5.
8. Run Train Simulator to verify that the installation worked.
NOTE: The default consists don't have HEP engines. To use HEP engines you have to edit/make up a consist in "Quick Drive".
Engines with Drivers:
- Mi P42DC Amtrak PhV
Mi P42DC Amtrak PhV HEP
- Mi P42DC Amtrak PhV (No Engineer)
Mi P42DC Amtrak PhV HEP (No Engineer)
ENJOY!!!