The Sunningdale level crossing is stuck down barring road traffic from travelling down London Road.
The crossing guards on the Sunningdale level crossing are currently stuck down as engineers try to work out why the system failed.
Victoria Bradley, a spokeswoman for Network Rail said the gates failed at 3.20pm.
She said: "The last update I had was that the engineers were on site and trying to work out what the problem was."
When level crossing gates break they are programmed to lock in the closed position.
It is not yet known how long it will take engineers to fix the problem.
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