Tag:railway=rail_brake

railway = 
Description
A device that reduces the speed of a freight wagon when sorting trains. Show/edit corresponding data item.
Group: railways
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Status: in use
More details at taginfo
Tools for this tag

In rail transport, a retarder is a device installed in a classification yard used to reduce the speed of freight cars as they are sorted into trains.

How to map

Use the railway= tag on node node where a retarder is.

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