"Then the driver said there was 'sunlight on the monitor' so the train couldn't proceed.
"The train probably stopped for about 15 minutes. I'm used to there being rail delays, but this seems ridiculous."
Another traveller, Ed Wiseman, 26, of Greenwich, said: "We were told the train was being held up because of strong sunlight.
"These conditions happen regularly, so I don't know why they haven't done something to stop the delays."
There were further delays this morning on the service because of signal and track problems.
A Southeastern spokesman said: “In regards to our drivers making decisions during their journeys about safety, we trust them entirely to make the right and proper choice to ensure they put the safety of our passengers first."