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Freight stock often has the words “Not to be loose shunted” –– what does this mean?

July 16, 2019, 1:30 PM
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In marshalling yards and elsewhere, a common technique of moving a wagon around is “loose shunting”, where the wagon to be moved is not coupled to the shunting loco, and simply pushed to the correct location.

Usually, a rake that is being built up is on one of several sidings branching off from a section of track where the shunting loco is working. The points are set to divert all wagons to the appropriate siding. The shunting loco pushes the wagon and imparts it sufficient speed so that it travels over to the selected siding under its own momentum. Once it reaches the rake that it is to be attached to, the “khalasi” staff couple it up to the rake.

The loco driver has to judge the distances and the weight of the wagon precisely so that the wagon does not stop short of the rake (which would necessitate using the shunting loco again to push it further), and so that the wagon does not have too much momentum which would cause it to crash into the rake being assembled with undue violence. Nevertheless, this process of loose shunting does involve a certain amount of violent impacts on all the wagons involved.

Such impacts are not desirable for wagons that are carrying sensitive cargo, such as cattle, poultry, or even human passengers in the case of sectional carriages being reattached to rakes, and extremely dangerous in the case of cargo such as petroleum products where an impact can cause leakage and ignition of the cargo with disastrous consequences. Hence, such wagons are marked “not to be loose shunted”, implying that they will always be shepherded gingerly into place coupled to a shunting loco.

Source – IFRCA.org

 

 

 

 
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