The round, bright yellow devices were stolen near Carfin station
Six railway detonators used to warn maintenance workers that a train is approaching have been stolen.
British Transport Police (BTP) said the detonators could be "extremely dangerous" in the wrong hands.
The round, bright yellow devices were stolen near Carfin station in North Lanarkshire between 12.45am and 1.45am on Sunday.
BTP said they were taken from beside the railway line.
Inspector Gary Brown said: "In the wrong hands the detonators can be extremely dangerous if not used for the purpose they were intended.
"If anyone finds, or is offered, the distinctive items please don't be tempted to misuse them and risk serious injury. I would urge you to get in touch with BTP as a matter of urgency."
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