The Rail Union RMT has been protesting over plans for cutbacks to railway ticket offices at London Midland stations.
The union says it fears the Government will give the go-ahead to ticket office closures or reductions in operating hours.
Officials say such a move would turn stations into a "muggers' paradise".
Leaflets were handed out today by protesters at Birmingham New Street station, warning of cuts at 86 stations.
London Midland has issued the following statement: