A rail company serving commuter routes into London is to provide more rolling stock to reduce overcrowding.
More than 800 people regularly travel on trains designed for 550
First Capital Connect services run from Norfolk, Peterborough and Cambridge through Hertfordshire into London.
New trains will provide 1,500 extra seats on morning services and 2,240 in the evening, the company said.
Managing director Elaine Holt said: "We have been working on solutions to overcrowding since we took over the franchise for the routes a year ago."
A recent survey revealed that more than 800 people travel every day on trains designed to carry 550 passengers.
Ms Holt said that the company was aware of this when they took over the franchise and ordered new trains and set out to review timetables.
"However, it takes time to upgrade the infrastructure on the lines, increase the capacity of the power supply and extend platforms for longer trains.
"All this is under way and now we are bringing in the new trains. Our aim is to give passengers a more comfortable journey," he said.