@mark s posted:
Presume the 'Grande installed that warning as a result of 4-6-6-4 #3703, which blew up in '52 due to low water. Five men perished in that incident.
One might wonder about that, Mark, but that was a standard D&RGW badge used on the water glass on all engines on that railroad. 3703 was equipped with one before the boiler explosion..