The BBC has the article on its website – see link below:-
This is an interesting situation and clearly Merseyrail were not fully aware of what the advertising company working on their behalf were doing. It led to a reverse ferret following a simple question to the public transport provider on Merseyside from a traveller who asked whether Merseyrail shared the opinions of Morrissey.
Of course it also begs the question about how far those displaying advertisements should investigate the views of those who benefit from such advertising. When is censorship right or wrong? A tough question and your answer will often depend on whether you share or despair about the views of those who are subject to censorship.