Southern revealed its bike ban in a letter to those who completed the 'Southern cycling survey' earlier in the year.
The company will be running a poster and leaflet campaign urging bike commuters to switch to folding bikes. The 'welcome to the fold' campaign starts on 16th December.
Concerned cycle commuters have created a 'stop the ban' website. The Cycle Train Commuters Group's site will "co-ordinate efforts to try and get Southern to rethink their cycle carrying policies on peak time trains running from the South Coast to London Victoria."
The ban will impact on cycle commuters travelling to London from Brighton. Last month, Brighton was revealed as one of Cycling England's 'cycle demonstration towns'.
Here's the ban on 'ordinary cycles':
Lots of wailing and gnashing of teeth from cycle commuters here: