Train Pipe Negative Pressure

HoggerDrew

CP/VIA Rail Modeler
Every now and then, I'll couple my engine and a couple of cars to a standing consist, when all of a sudden my Train Pipe pressure bottoms out from 70 down to -(negative)4 or so. What troubles me is that as soon as I uncouple the string of cars that I just pinned to, the TP pressure jumps back up to 70 and I can move the engine and it's consist again.

What would cause the TP do go into the negative?



 
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Sounds like a broken regulator in one of the cars, or just a bad [job of] hose coupling. Though that should not actually suck air out of the line, should it?
 
I'm not sure.....I know it would go to zero, but my actual experience with air brakes is limited to my transport.....no clue what causesit in Trainz though which is absolutley frustrating
 
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