powder train

powder train

[′pau̇d·ər ‚trān]
(engineering)
Train, usually of compressed black powder, used to obtain time action in older fuse types.
Train of explosives laid out for destruction by burning.
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References in periodicals archive ?
The powder train inside the fuse burns at a controlled rate until it reaches the primer cap, at which time the powder in the cap explodes.
When the primer fires, the powder in the ignition chamber is the first part of the powder train to be ignited.
In 1775 an accidental encounter between some of Gage's troops and American minutemen at Lexington lit the powder train of the War of Independence.
The powder train was laid; all that was needed was the spark.