The grandmother of a baby girl born on a train packed full of commuters during rush-hour said today: "We're all still in shock."
Mari-anne Stanley was travelling home with the unnamed woman who suddenly went into labour on board the 18:18 London Victoria to Maidstone East service last night.
Passengers on board the Southeastern service were asked to move off the train or into a separate carriage as a midwife, nurse and police officer, who were off-duty, came forward to help.
Ms Stanley said the mother gave birth a week early to a "perfectly healthy" 6lb 13oz baby called Phoebe on board - who was greeted with cheers by other passengers.
"The train was stopped at West Malling to let passengers off and I ran off to the driver telling him we needed to not go any further and call an ambulance because she was giving birth.
Mum and child are doing very well. They are expected to be released from hospital today. We would like to thank everybody involved yesterday.
"We'd also like to apologise to all the passengers who were delayed but the circumstances were such that we simply could not go any further."
More top news
Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.