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June 25, 2019, 01:34:59 pm *
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Author Topic: WoE over-running engineering works 16 April  (Read 521 times)
bradshaw
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« on: April 16, 2019, 09:38:06 am »

Work between Salisbury and Tisbury has decimated the service, with disruption expected to last until end of service.
So far only the 0510 Exeter has got through and that, via Westbury, was terminated at Salisbury. Everything now going that way.
With all stock arriving as ecs in the morning there would be none available except that for the 0510. As a result the next up service will probably be the 1125 EXD while the first down will be the 0710 WAT, running late due to the diversion.
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bobm
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« Reply #1 on: April 16, 2019, 09:49:42 am »

Tamper ran through a set of points at Wilton.
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Phantom
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« Reply #2 on: April 16, 2019, 10:23:50 am »

Tamper ran through a set of points at Wilton.

I hate to be the one to ask, but what is "Tamper"?
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bobm
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« Reply #3 on: April 16, 2019, 10:37:03 am »

Something you type very carefully when auto-correct is about.   Grin

Seriously though it is an engineering train which moves the ballast and levels the track.

Not sure if this is a tamper or a stoneblower - but they look similar.

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paul7755
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« Reply #4 on: April 16, 2019, 11:55:45 am »

I think a video might explain better how a tamper does its job.   A stoneblower effectively is a tamper with the extra ability to add more ballast in a controlled manner.   

https://youtu.be/lQg1U5FxyS0

Paul

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ellendune
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« Reply #5 on: April 16, 2019, 10:59:55 pm »

I think a video might explain better how a tamper does its job.   A stoneblower effectively is a tamper with the extra ability to add more ballast in a controlled manner.   

https://youtu.be/lQg1U5FxyS0

Paul

It is not clear from the video, but the tamper is also lifting the track as well as squashing the ballast.  As a student in the 1970's I worked on tamper development including the development of vibration to stablise the track after tamping (which was first used to allow track to be opened at line speed after blockades such as at Crewe) and the stoneblower development project. 

The problem with conventional tampers is the track subsides back to its old profile. Most of this happens in the first few load cycles. Broadly the first load does as much damage as the next ten and the following 100 cycles. 

Dynamic track stabilisers allow allow the track to be overlifted and then knocked back to the right profile before opening to traffic. 

Stoneblowers work by blowing additional ballast under the sleepers with compressed air.  It actually uses smaller sized stone otherwise it wouldn't get down the inside of the tines of the tamper.
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bradshaw
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« Reply #6 on: April 17, 2019, 08:31:42 am »

Line reopened 0415 this morning, 17th of April
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grahame
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« Reply #7 on: June 04, 2019, 10:01:41 pm »

An old tamper - from before the time that other gizmos were fitted - it's a bit clearer to see the moving part

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