SP 4449 and UP 844 Whistles!
https://prrt1steamlocomotivetrust.org/ - Please help fund the T-1 Trust! They are a wonderful organization, building an advanced new 4-4-4-4 T-1 steam locomotive from scratch!
One of the most viewed, recommended and relevant SP 4449 and UP 844 videos on youtube! First, the 4449's standard Whistle on National Train Day, then it's original Daylight one, then UP 844!
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