I must admit, I wouldn't know what to do if I arrived at Shrewsbury station without a ticket by having started from an unstaffed station (there are several unstaffed stations in the area) and the barriers were closed. There's no ticket office inside the barriers. Looking at the
plan, there is a Customer Assistance Point (which is on the platform and not the subway as the map seems to imply) - I've seen it in real life, but never used it. I don't know if they sell tickets though.
Similar situation with Birmingham New Street - there seems to be no ticket office inside the gateline in the
plan, but there is a 'Rail Information' point next to the barriers and on the inside. I don't know if it sells tickets though.
Anyway, what should one do if one reached either Shrewsbury or Birmingham New Street without a ticket?