The local newspapers made a big deal of this which is why I have found out (I have no sources from within the industry) however they made it clear that the railway is a very safe environment. Indeed if one were to change modes to his car for commuting the risk of death would dramatically increase, in 2009- 922 people died in a UK car crash* compared to UK Rail Passenger Mortality total of guess what? - zero.
So in terms of safety Railways are king, most people will hopefully not be repelled from using the branch.
Another note, I have seen 465s (4 carriage version of the 466) operating the branch every week day (I haven't checked Saturdays). This is good for peak overcrowding, I am skeptical as to whether this is permanent as it did happen last year or the year before that but soon ceased. However it has been going on for a while now.