Hammer Blow

Hammer blow, in rail terminology, refers to the vertical forces transferred to the track by the driving wheels of a steam locomotive and some diesel locomotives. The largest proportion of this is due to the unbalanced reciprocating motion, although the piston thrusts also contribute a portion to it. It is the result of a compromise made when a locomotive's wheels are balanced to off-set reciprocating masses, such as connecting rods and pistons, in order to keep the ride as smooth as possible. However, hammer blow occurs with the downward force of the wheel's balance weight onto the railway track, with the potential of causing damage. The rails are subjected to an intense and regular pounding, which can in some cases cause damage to the rails or other structures. The forces are also known as dynamic augment.

Read more about Hammer BlowPrinciples, Causes, Solutions

Other articles related to "hammer blow, blows, hammer, blow":

Highland Railway River Class - Delivery To Highland Railway
... had designed the 'Rivers' to cause much lower 'hammer blow' upon the track than the existing Highland locomotives ... When the effects of hammer blow were taken into account, the 'Rivers' put the same total weight onto the track as the previous 'Castle' Class 4-6-0s ... Smith argued that the effect of hammer blow needed to be taken into account, but the company's board sided with Newlands and Smith was forced to resign ...
Alma Problem - Alma and The Fifth and Sixth Symphonies - Sixth Symphony - Third Hammer Blow
... that the symphony was 'prophetic', she then identified these three blows with three later events in her husband's life his 'forced resignation' from the Vienna State Opera the death of his eldest daughter and the ... claims that Mahler eventually deleted the third hammer-blow from the score out of sheer superstition, in an (unsuccessful) attempt to stave off a third disaster in his own life ... to mention that Mahler's discovery of her own infidelity was a 'blow' of far greater weight than at least one (and possibly two) of the other events she does mention ...
Hammer Blow - Solutions
... the driving power over multiple sets of pistons, thus greatly reducing hammer blow ... The Soviet Union used a different solution to hammer blow with their 2-10-4 ... on the wheels to be smaller and reducing "hammer blow" on the track ...

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