|Video at 12:32|
|Video at 0:15|
|Video at 1:57|
A video of a unit that does three ties at a time with a movable carriage so that the unit itself advances in a continuous motion.
|Video at 0:14|
|Micky Cecil posted|
[Sometimes you need some more ballast before you can bring in the tamper. Is the guy trying to see if it is bent sideways as well as down? Where is the hard hat and safety vest?]
|Joe Dockrill posted|
FYI for those that don't know what a tamper does or how it works:
Tamping tines pack the ballast under the sleeper to produce a stable sleeper bed.
Plasser & Theurer developed a mechanised technique for this purpose: the system of non-synchronous constant pressure tamping which in professional circles is regarded as pioneering and unequalled in quality. The tamping tines penetrate the ballast bed from above and compact the ballast under the sleeper with a squeezing movement. Two factors are decisive here. Firstly, all tamping tines work with the same pressure; and secondly, the tamping tines vibrate with the ideal frequency of exactly 35 Hz. This directional, linear vibration combined with the non-synchronous tine movement produces a homogeneously compacted ballast bed.
[It is a shame the group is closed because many of the comments were informative.]
|Jdoc Jdoc shared|
Fred Bain Humm... taken from the clamp frame looking back. Obviously a switch capable tamper.
In this screenshot, note the two wheels in the lower-left corner that catch the rail under its flange and lift it to the correct height. Also note the hoses in the upper-left for all of the hydraulic circuits that are needed to operate the machine.
|Then I came across a posting of this video (-2:00) showing that the operator rides under the machine behind the carriage. Note that he has a camera screen in the upper middle so that he can make sure the flange wheel is doing its job of lifting the rail.|
David Brumley posted two photos with the comment: "Triple head plasser!"
Then Jdoc posted this video with the comment "little mud spot tamping. not mine, 3X tamper. another exclusive video........." I don't know if this is a closeup of what is happening in the second unit or if this is the first unit used in a different (touch up) mode.
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Frederick Keys T32 prototype joe, there's a video of it working online. Harscos first tamper with a wire lifting system instead of the double barrel. [Unfortunately, I don't understand what "wire lifting" and "double barrel" means.]
Stan Sandstrom Clifford is correct regarding the wire lift and line. It also has Youngman Positive Dislacement workheads which were developed in Australia. This machine is likely either in New Zealand or Australia.
Damien Smith Stan Sandstrom this machines was built in the states but yes the heads are Australian designed.
Frederick Keys 32 tool continuous action, not quite a 09-32 but they've had a fair crack at it. [The UP Plasser American pictured above may be the 09-32 that he is referring to.]
[I don't see the telescoping projector buggy at one end that I associate with tampers.]
Evidently a stoneblower makes tampers obsolete even though fancier tampers are still being designed. American railroads like to brag about their innovative technologies (a recent example), yet they won't try a stoneblower.
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Fred Bain Quite the concept. Treat just the wounded and don't disturb the ballast.
Stan Sandstrom Its a great machine. Harsco sold a lot of them in the UK. Unfortunately no US Railroad would try one. Two reasons I heard were 1. Some customers thought it wouldn't work on heavy haul track 2. They are very expensive and Harsco management didn't want to build one as a demo unit and no railroad wanted to buy one without a long trial period before purchasing. Only harscos sales department knows for sure.
(April 2019 Update: Harsco still has an icon on their videos page, but it is also broke.
So I have to switch to a text and photo description. [HarscoRail-web]
|Joe Dockrill shared|
stoneblower, a different type of surfacing, minor surface deviation correction by injecting stones