Re: HO Tank Car Lid


A friend who recently retired from supervising the Exxon tank fleet had a number of photos like that.  Most were related to cleaning, not unloading.


On of the funniest however was a line of tank cars with modern lock-tight couplers. One of the cars was missing a truck. Somewhere on the trip the truck derailed and left the track but the tank car stayed coupled to cars on both ends and finished the trip.


J. Stephen Sandifer


From: <> On Behalf Of Tony Thompson
Sent: Monday, November 23, 2020 2:16 PM
Subject: Re: [RealSTMFC] HO Tank Car Lid


Allen Cain wrote:

As the volume (V) increases as the tank is emptied the pressure (P) must decrease proportionally creating a vacuum to balance the equation.  This can and has collapsed many storage tanks.  Not sure if a rail tank car is strong enough to avoid collapsing as a full tank is drained to empty?


You mean like the one shown below? This one was steam cleaned and the manway closed with the tank hot. As it cooled and the pressure inside decreased, voila!


Tony Thompson



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