London Bridge station upgrade to cause disruption
26 March 2014 Last updated at 20:06 GMT
London Bridge station is being transformed in a multi-billion pound upgrade that is part of the biggest station rebuild that Network Rail has ever carried out.
The work is due to be completed in 2018, but commuters are being told to expect "years of disruption" before it is completed.
BBC London's transport correspondent, Tom Edwards, spoke to Dave Ward from Network Rail and Alex Foulds from Southern Trains.