Another day of strikes has been scheduled for July 27, ensuring little or no service on any trains south of London on that date.
Govia Thameslink says any trains running will have a late start (7.30am onwards) on the day and the day after (July 28) with trains expected to run until between 4.30pm and 6.30pm depending on the line.
Passengers are advised not to try and travel as trains will be crowded, but if they do, to check online before they set off.
A spokesperson said:
"Passengers should travel only if absolutely necessary on Southern, Great Northern and Thameslink on Wednesday 27 July and the morning after due to next week’s strike by RMT members at Network Rail and UK train operators.
"Operator Govia Thameslink Railway (GTR) will be running the same service plan as for the last strikes in June and warns there will be very few trains, with crowding expected, particularly on last trains, and possible delays. Gatwick Express will not operate although the airport will have a limited Southern and Thameslink service."
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