What is that sound???? I've always heard it getting off the train and never knew what it actually was

@@ApolloBoyothe air compressor but the whoop sound is only on ge made engines

​@@ApolloBoyo"pfffst, bwuaaaaaii"

Tyler Mac me too

They not fully retiring bro they’re going to do short city to city routes not long cross country state to state routes anymore

I know they are so cool looking

@@mrjohnson20123 I know, it's when they retire.

The same could have been said about the P42s and P40s replacing F40PHs…

Because the head-end-power alternator is driven by the diesel engine (prime mover). So, in order to provide a steady voltage to the passenger cars it needs to run at a constant speed (900 RPM). Now, the more power you demand from an alternator/generator, the harder it is to turn. So, you need more power from the engine to maintain the RPM. When you're accelerating, especially if you're in notch 8, the traction motors are demanding a lot of power from the main alternator, which makes it very hard to turn. So, in order to maintain 900 RPM the diesel engine needs to add more power. That's why in head-end-power mode, when the train is accelerating the rhythm of the engine stays the same, but the noise becomes louder and "grouchier".@@theonlyshortsalot

Both units are not use to pull the train? Only 1 unit pulls and the other provides HEP?

Both units pull the train. One unit has all of the horsepower available for traction, the unit providing HEP has whatever horsepower is left from the HEP load.@@JaySpec13

​@@JaySpec13 From redditors I've been told that 800rpm constant is needed to both pull the train and to reach 60hz to power the railcars. So I think both locos could be pulling.

@@JaySpec13 they both pull but only one provides hep

if you talking about the whoop sound, its the air compressor startong. you can only find these exclusively on GE locomotives

If i remember correctly Cary is an extended stop and i recall having to do two stops to service the coaches and sleepers separately

General Electric (GE) is the company that produced the P42DC.

Genius in the house🤓

They are part electric the diesel engine drives a generator which then supplies electricity to the traction motors which sit in between the wheels !!!!a basic answer!!!

You mean the locomotives that Amtrak has used since 1997? The locomotives that have reliably stayed in very active revenue service for almost 30 years and still going strong? The locomotive that beats the ALC-42's 8 times out of 10 for reliability? The locomotive that doesn't need help from an older engine in colder climates? The locomotive that is much more fuel efficient that the new ones? The locomotive that's worlds easier to maintain than the new? Yeah, I'll stick to my GE Genesis locomotives. We'll pass you going 80+ while you're in a siding trying to figure out why you're engine won't work in the freezing cold.