Undercutting: Removing, Replacing and Recycling Ballast
Undercutting cleans impure ballast to extend track life. Watch Union Pacific's engineering team complete the process and improve track surface.
Track ballast - Wikipedia
One method of "replacing" ballast is to simply dump fresh ballast on the track, jack the whole track on top of it, and then tamp it down. [13] Alternatively, the ballast underneath the track can be removed with an undercutter, which does not require removing or lifting the track.
The purpose of track reconditioning is to reconstruct the track formation and ballast to restore the track structure to a standard appropriate to current track loading. Reconditioning usually involves the removal of rails, sleepers and ballast and a predetermined depth of the existing formation and the reconstruction of those
Ballast | Trains Magazine
2024年2月15日 · A key job for ballast is to transmit the weight (or “load”) of the track and, more significantly, the trains passing over it, to the subgrade. These loads produce pressures averaging 100 pounds per square inch underneath each tie, far greater than earthen subgrades can bear on a repeated basis without settling.
Review of ballast track tamping: Mechanism, challenges and …
2021年9月20日 · Ballast bed deterioration changes the ballast track geometry, which leads to uncomfortable rides, exacerbates wheel-rail interactions and, most importantly, causes safety issues (e.g., derailment). To align the track geometry, tamping is the most widely used means of filling ballast-sleeper gaps and homogenizing ballast beds.
Maintaining ballast below the ties - Railway Track and Structures
2012年8月9日 · Georgetown Rail Equipment Company’s latest service offering, BallastSaver, utilizes technology as an alternative to the traditional “experience tells us” methods of determining the quantities of ballast needed to maintain safe and efficient track conditions.
Ballast Maintenance - Loram
Maintenance of the ballast layer directly below the ties is an essential part of a healthy track structure. Ballast degrades over time and becomes increasingly fouled reducing its ability to drain, provide adequate load bearing support and withstand vertical, lateral and longitudinal forces.
Refurbishment of ballasted track systems; the technical challenges …
2015年9月1日 · The use of mechanised ballast replacement techniques has developed over the last 30 years ranging from intrusive and non-intrusive processes. UK national policies have now recognised refurbishment of ballasted systems as an economic alternative to complete renewal especially in locations of switches and crossing (S&C) layouts.
Ballast Maintenance - Railway Track and Structures
2013年8月5日 · Loram Maintenance of Way, Inc., offers ballast services that include shoulder ballast cleaning, spot undercutting with the Loram Railvac and track lifting with the Track Lifter Undercutter Series (TLU).
Ballast replacement, sleeper replacement & TBR renewal - TSO
TSO is the expert in Track Ballast Replacement (TBR) using mobile mechanised rail worksites to replace every component of the rail track: rails, sleepers and ballast. TBR is a major maintenance operation. Other on-demand and routine maintenance tasks can also be mechanised, including ballast replacement (BR), rail replacement (RR), sleeper ...