Question about the PRR S1

Trainz_12_fan_100

yes thats my name
Did the Pennsy S1 6-4-4-6 duplex have a whistle or a horn? I got really confused as to whether it had a whistle or a horn after I saw this video of a unreleased model of the engine.

But yet I have been told it has a whistle and I have not heard if it had both.
I have tried google searching it but could not find anything. I'm just confused and would like to know the answer :)
 
It had an airhorn. Air horns tend to be louder when traveling at faster speeds. You can actually see the airhorn sticking out under the handrail on the smokebox nose.

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