Passengers at Waterloo Station can now refill their water bottles for free at a new drinking water dispenser.
Network Rail installed its first drinking water fountain at Charing Cross earlier this year, and now the initiative has spread south of the river.
The new dispenser is located on the balcony above the main concourse, between The Cabin and Carluccio's, opposite the entrance to platforms 1 and 2.
"We're delighted that the free public water fountain is now up and running at Waterloo station," said Jason Murphy, Waterloo area manager for Network Rail.
"This is a really important step in improving passenger experience at the station and in showing our commitment to reducing waste."
Alan Penlington, South Western Railway's customer experience director, added: "This is great news for our customers who use Waterloo Station. We are committed to increasing our recycling rates across our network to 90 per cent and have already reached our ambitious zero waste to landfill targets.
"The public water fountain will help customers keep hydrated and hopefully also reduce waste from plastic bottles."
Network Rail says plans are in hand to add further water fountains at Waterloo.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.
7,000+ locals read it every week. Can you afford to miss out?
Read the latest issue before signing up