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Class 334 banging noise

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Eng1Alpha

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Joined
23 Jul 2016
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Hi
I am a daily user of Scotrail's 334 train and on a recent journey there was a loud banging noise from the underside of the train. Almost like someone was striking the underside with a metal pole. It happened at various times. Braking-accelerating-idle.
It was loud enough other passengers were startled each time it 'pinged'. The best description is similar to a cat spring when it snaps.

Just curious, but any info welcome.
--- old post above --- --- new post below ---
Car Spring! Oops.
 
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Peter Mugridge

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8 Apr 2010
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Was it definitely from the underside?

My first thought is it's the vacuum circuit breakers operating on either side of a neutral section, but I would expect the noise from those to be from the roof area.
 

ExRes

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16 Dec 2012
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Back in Sussex
Could it have been some Remainers hanging onto the underside of the train while trying to sneak into Free Scotland from England?

:idea:
 

Eng1Alpha

New Member
Joined
23 Jul 2016
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Hi,

Yes definitely underside. It was directly beneath our feet. I thought maybe a loose brake pipe. But it was a very loud deafening ping.
 

NotATrainspott

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2 Feb 2013
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3,244
It's not a compressor. It's almost as if there's hard parts of the body and bogies which are sometimes coming into contact.
 

bengley

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18 May 2008
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Most likely a knackered bush or something on the suspension - not dangerous but definitely something which should be fixed sooner rather than later.
 

318259

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Joined
11 Jun 2011
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176
They've always done that from time to time. It's not just a noise, you can actually feel an impact through the floor.

I always thought it was either the suspension or something like a loose stone or Irn Bru bottle being flung up from the tracks and hitting the underside of the train.
 
Joined
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Anti-roll bar bushes a regular one.

This^^^

Failing that, damper bushes, bump stops making contact due to incorrect vehicle heights,traction centre bush worn, just about any part of the underframe mountings loose / bushes worn.
 
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