How come they've suddenly started popping up? I've taken Chiltern down the entire mainline for years and I've never seen an inspector, except occasionally at the beginning of the train journey in London Marylebone (which makes no sense to me, because Marylebone has barriers anyway). However I've now started seeing them semi-regularly between Moor Street and Solihull. Is this a new thing or have I just coincidentally been getting on unexpected (edit: uninspected!) trains in the past?