Personally I find the whole concept of penalty fares rather odious. The idea that you punish a passenger who doesn't have time to queue for a ticket and wants to buy on board, says all you need to know about certain TOC's attitude to customer service.
However, browsing through London Midland's leaflet here http://www.londonmidland.com/download/491.4/penalty-fares-bookletpdf/ I couldn't help noticing the first paragraph on page 2:
"In common with most train operating companies, London Midland operates a penalty fares system on its services."
This smelled fishy, so I checked. Of the 29 TOCs listed at http://www.nationalrail.co.uk/tocs_maps/tocs/ only 8, according to the detailed information listed against each one, operate any kind of penalty fares scheme.
That, London Midland, is not "most".
However, browsing through London Midland's leaflet here http://www.londonmidland.com/download/491.4/penalty-fares-bookletpdf/ I couldn't help noticing the first paragraph on page 2:
"In common with most train operating companies, London Midland operates a penalty fares system on its services."
This smelled fishy, so I checked. Of the 29 TOCs listed at http://www.nationalrail.co.uk/tocs_maps/tocs/ only 8, according to the detailed information listed against each one, operate any kind of penalty fares scheme.
That, London Midland, is not "most".