A spokesman for Southern trains said:
"Southern achieved improved scores in many of the categories, but we are disappointed that our overall satisfaction score hasn’t risen.
"We recognise that performance is a key driver to achieving passenger satisfaction and for much of the survey period, general railway infrastructure problems and a particularly difficult leaf fall season made it a particularly challenging period for us. We operate around 2,300 trains each weekday on one of the country’s most congested networks where knock-on effects from one small incident can cause major problems.
"We are analysing the results and will be working hard on a plan to improve in the areas where our passengers tell us we need to."
More top news
A luxury penthouse in Mayfair has just broken the record for the most expensive home ever sold in the UK
Simon Harris talks to the Labour politicians hotly tipped for the Mayoral race in 2016 - but only one will admit he is standing
ITV London's Political Correspondent Simon Harris takes a look at the Labour candidates vying for the capital's top job in 2016