B&M track
- Thread starter andrus
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Anonymous
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Well, it's usually nothing in them, the "shell" of the Box-section which gives it the strength. Hence the name Box-section...
As the noise regalement have become stricter they usually fill this void with sand (or other) to deaden the Box-section "Roar", this roar comes from the air rushing inside the spine as the train passes by.
Also as a trivia, this Box-Section roar can be used as a sleeping-aid since it's basically White Noise (which some says help you to sleep), but coaster geeks might instead try and listen which coaster it is instead of sleeping
As the noise regalement have become stricter they usually fill this void with sand (or other) to deaden the Box-section "Roar", this roar comes from the air rushing inside the spine as the train passes by.
Also as a trivia, this Box-Section roar can be used as a sleeping-aid since it's basically White Noise (which some says help you to sleep), but coaster geeks might instead try and listen which coaster it is instead of sleeping
Ingested Banjo
Mega Poster
^ I think it's just the air vibrating, not actually rushing along. Like, our school installed this pointless new sign outside the sixth form block saying 'sixth form'. Basically a hollow oblong of metal, about 3 metres high, by 1 metre wide, by 20 cm deep. If you even tap it, it makes a loud 'clunk' sound. Now imagine a huge train rushing over that... it would be loud...
If the air actually does rush through, I'm not sure.
EDIT: Although I can speculate that the vibrations in the air cause a slight pressure change, so, as if the track were being squeezed like a ketchup satchet, the air could begin to move slightly in the direction of the train, possibly compounding the first effect.
EDIT 2: Oh also, you get the effect on railway trains that you can hear the track vibrate a lot sooner than you can hear the train, so with the air trapped inside, the vibrations might run down the steel faster than they run through the air, so at a cross section of the track, the vibration of the air, and hence the noise at that specific point in the track could gradually build until the train roars past, and then fade away slightly faster, (slightly faster because of the doppler effect meaning the train leaves behind fewer waves that it pushes forward).
That's all I can think of. Really, this time.
If the air actually does rush through, I'm not sure.
EDIT: Although I can speculate that the vibrations in the air cause a slight pressure change, so, as if the track were being squeezed like a ketchup satchet, the air could begin to move slightly in the direction of the train, possibly compounding the first effect.
EDIT 2: Oh also, you get the effect on railway trains that you can hear the track vibrate a lot sooner than you can hear the train, so with the air trapped inside, the vibrations might run down the steel faster than they run through the air, so at a cross section of the track, the vibration of the air, and hence the noise at that specific point in the track could gradually build until the train roars past, and then fade away slightly faster, (slightly faster because of the doppler effect meaning the train leaves behind fewer waves that it pushes forward).
That's all I can think of. Really, this time.
