If you travel on the District line, you'll already have seen changes we've introduced to make your journey more comfortable.
We refurbished your trains between 2005 and 2008. They now have automated visual displays and station announcements, plus the reassurance of CCTV.
We also want to make it easier for everyone to use the Tube, so the trains also have tip-up seats which can accommodate wheelchairs or are useful if you're travelling with bulky items like luggage or a buggy.
In July 2011, we agreed a new contract - our biggest ever - to deliver a new, modern, centralised system on the District line, together with the Circle, Hammersmith & City and Metropolitan lines. This state-of-the-art system will replace a number of older systems, including manual signalling dating back to the 1920s at Edgware Road.
We know it's not something you see or take much notice of, but new signalling will allow us to run more trains, more often and with fewer failures. Combined with bigger trains that we can move more quickly and closer together, it'll mean more room - or capacity - on the line.
That's good news because as London keeps growing there'll be more people using the Tube. When the upgrade is complete the line capacity will increase by 24 per cent, which means we can carry about 10,000 more passengers an hour.
From 2014, we'll be introducing 80 new trains. These will be air-conditioned and have walk-through carriages. To improve accessibility, they will also have wider doors and walkways, lower passenger alarms and a smaller gap between the train and platform.
The new trains should all be in service by 2016.
See a preview of the new trains that will be introduced in 2013.
In February 2012, we completed major redevelopment work at Blackfriars station.
Benefits include an upgraded station with step-free access, increased capacity and better interchange between Tube and National Rail services.