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London & North Western Railway Society
Glossary for the LNWR Society

Glossary Results for Word "Hammer Blow"

Hammer Blow The reciprocating parts (connecting rodsExplain 'Connecting Rod' etc.) of a locomotive which are partially balanced by weights attached to the rims of the driving wheels deliver a hammer blow to the track at each revolution which can greatly exceed the static axle loadExplain 'Axle Load'. This increases with the speed, and is especially damaging to bridges. Hence it may account for speed restrictions on certain lines. A three- or four-cylinder locomotive (such as a ‘Claughton’Explain 'Claughton 4-6-0 Locomotive Class' 4-6-0) is much better balanced than a two-cylinder one, with consequent reduction in the hammer blow.