UP 4014         
Is the steam let go to regulate over pressure of the boiler before the pop off valve goes off?
Date: 11/13/2019 Location: Prescott, AR   Map Show Prescott on a rail map Views: 203 Collection Of:   G Gerard
Locomotives: UP 4014(4-8-8-4)    Author:  G Gerard
UP 4014
Picture Categories: This picture is part of album:  UP 4014 chase in Ark & OK
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