Popping noise!

[Anonymous]

Every time I see a West bound Hopper Train that doesn't go bang bang bang bang........................(Flat wheels).

Anyway! As the Hopper is rolling by there is a constant Popping down where the Wheels roll over (meets) the Steel Rails as the Train rolls by. I have knocied this for many years now but still quiet haven't figured it out by now.
This happends all the time.
If you all think that im very crazy please let me know ok?[:D]
BNSFrailfan.

[dldance]

so where you watch them - is westbound empty or full?

dd

[dknelson]

I hear that popping sound a lot when I railfan. It usually turns out to be one of my railfan buddies standing next to me. Those Burger King lunches can be murder ....
Dave Nelson

[tree68]

Probably the flexing of the rail surface. You may think steel is hard... Check out the loaded weight of one of those cars going by and divide by 8. That's the weight on each wheel, in the area of what, a quarter or half dollar? The steel actually gets rather plastic.

[mvlandsw]

I hear noises like that. Usually when running an engine around sharp curves on rusty rail.