Er ... actually I went the last three times we played at Selhurst, and I was describing my own experience accurately. Last time, I was kettled, and then escorted back to the station, where I got a train going north and not a train going to Brighton, with no difficulty.
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You're not forced onto any train. Once you've been 'escorted' to the station, and having been duly entertained by your fellow Brighton fans kicking off the wing mirrors from the cars of innocent local residents, chucking their dustbins into their front gardens etc, you can catch any bloody train...