Police are trying to work out why a man collapsed outside Brighton station.
Conductors call off 2 strikes to hold 1
But passengers are also being warned to expect disruption for the rest of the week - because of a lack of available conductors.
A union official said: ``We realise that this dispute may be prolonged. We therefore cancel the strike action called for Tuesday 10th May to Wednesday 11th May and for Thursday12th May to Friday 13th May.
``Instead, we instruct our members to take strike action by not working any shifts that book on between 0001 and 2359 on Friday 20th May.''
A woman in her 40s has been dragged into woods in Caterham and sexually assaulted as she walked home.
National protest in support of Southern Rail guards
Hove, Bognor, Barnham and Worthing services on Monday 24th Oct, then Brighton, Southampton and Hastings by end of the month.
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