The MTA has been installing deadbolt locks on subway cars of the No. 7 line in an effort to reinforce the control cabs against break ins , the Daily News has learned.

The locks — high-security deadbolts manufactured by Medeco — have started appearing on cab doors across the line in recent months, as observed by The News.

The locks, which require a more complex key than the typical apartment deadbolt, sit just above the built-in lock on the train cars where it’s installed.

Sources with knowledge of the installation said the locks are part of a pilot program to secure the doors against intruders, part of a wide ranging effort to curb train break-ins, joyrides, and subway surfing.

So far, the locks only appear to have been installed on a portion of the R188 train cars in use on the No.

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