GG1 Pennsylvania Electric Locomotive
The PRR GG1 was a class of electric locomotives built for the Pennsylvania Railroad (PRR), in the northeastern United States. Between 1934 and 1943 General Electric and the PRR's Altoona Works built 139 GG1s.
The GG1 entered service with the PRR in 1935 and later ran on successor railroads Penn Central, Conrail and Amtrak. The last GG1 was retired by New Jersey Transit in 1983. Most have been scrapped, but several are in museums.
The GG1 was 79 feet 6 inches (24.23 m) long and weighed 475,000 pounds (215,000 kg). The frame of the locomotive was in two halves joined with a ball and socket joint, allowing the locomotive to negotiate sharper curves. The body rested on the frame and was clad in welded steel plates. The control cabs were near the center of the locomotive on each side of the main oil-cooled transformer and oil-fired train-heating boiler. This arrangement, first used on the Modified P5 class, provided for greater crew safety in a collision and for bi-directional operation of the locomotive. A pantograph on each end of the locomotive body was used to collect the 25 Hz, 11,000 V alternating current (AC) from the overhead lines. In operation the leading pantograph was usually kept lowered and the trailing raised to collect current, since if the rear pantograph failed it would not strike the forward pantograph. Transformers between the two cabs stepped down the 11,000 V to the voltages needed for the traction motors and other equipment.
this project was created from original video recordings of the GG1 Electric Locomotive of the Pennsylvania Railroad and the use of original recordings
from other author's
Author: Barry T Gaskin
(A) Function Key Usage:
F2- Horn [CV150 selects Horn type]
F3- Coupler crash [Autocoupler/brake set by CV151 max spd]
F4- Air features disable - F4 to OFF enables pop-off,drier and starts compressor
F5- Dynamic brakes
F6- Not assigned
F7- Not assigned
F8- Mute control, [F8 ON is muted.]
F9- Engine brake squeal
F10- Grade crossing airhorn sequence
F11- Milepost indicator
(B) AEM-7 Sound FX defined CV's: [sound project download reset value in sq. brackets]
CV58 Master Volume, 0-15, 0= max, (F8 used for mute) 
CV122 Product type, 12 = Digitrax SFX sound decoder (Read Only Value)
CV123 Hardware version (Read Only Value)
CV135 Volume when muted 
User configurable Sound CV's:
CV140 Prime mover volume 0-64 
CV141 Bell volume 0-64 
CV142 Horn volume 0-64 
CV143 Air features volume (popoff, drier, comp) 0-64 
CV144 Dynamic brake volume 0-64 
CV145 Misc volumes 0-64 
CV146 Bell delay (1 = 24mS) 1-100 
CV147 Drier rate (1 = about 2 secs) 1-64 
CV148 Compressor start rate 
CV149 Compressor run time 
CV150 Horn select: 0=default, 1=playable default, 2=alt. horn, 3=playable alt. 
CV151 Peak speed to allow auto coupler/brake on DIR change and F3 on 0-60 
CV152 Author ID Alex Stroshane = 0xAA 
CV153 Project ID AEM-7 
CV154 Auto horn signals: 0 = Off, 1= On 0-1 
CV156 Bell selector: 0=default, 1=alternate 0-1 
(C) General Notes
This sound project was designed for the GG 1 locomotives built for the pennsylvania railroad
Because the throttle of an electric locomotive is continuous, with no "notch" positions, there is no semi-auto or manual
notching functionality in this project. Instead, the sound of the traction motors varies directly with the speed. In real
life, little is heard above the humming sound of the blowers that run constantly - electrics are a lot quieter than diesels!
This sound project has been assembled from Digitrax-supplied sound clips as well as new sounds from custom recordings. I am
also indebted to Bob Grosh and Fred Miller for their early work in deciphering the SDF language and engineering new functions.
Some engine sound recordings by Alex Stroshane, copyright 2006.
Additional engine and horn/bell sound clips courtesy of Barry Gaskin
This sound project was designed for the GG 1 locomotives built for the Pennsylvania railroad. This project was put together using good video and film footage of this Loco in action in different locations. The horns where a hard target to get, but they are original GG1 sounds. I have used other sound recordings in certain places as it was difficult to get all originals.
Because the throttle of an electric locomotive is continuous, with no "notch" positions, there is no semi-auto or manual notching functionality in this project. Instead, the sound of the traction motors varies directly with the speed. In real life, little is heard above the humming sound of the blowers that run constantly - electrics are a lot quieter than diesels!
With Digitrax Sound FX decoders and downloadable sound project files (.spj), you can download your choice of sound schemes into any Sound FX equipped locomotive. You can use spj’s that are available for free, you can modify those schemes or you can create your own!
Digitrax offers a wide variety of Sound FX decoders to fit many different locomotives. You’ll need to have a Digitrax SFX decoder installed to take advantage of using .spj files.Click here for Digitrax Sound FX decoders
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