Southern Rail said trains are being delayed 'due to a number of incidents' between Gatwick Airport and Three Bridges.
"Delays have occurred because passengers have caused a disturbance on board a train which emergency services will attend," a spokesperson wrote on Twitter.
"There is also planned engineering work, meaning there are less platforms than normal available at Three Bridges and there was an operational incident.
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"You may need to allow up to 15 minutes extra to complete your journey this evening."
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