Hi I was watching a documentary about the 1864 murder of Thomas Briggs in east London. A major factor of this case was non-corridor stock where a victim and his attacker were isolated in a single compartment. I believe non-corridor stock was immediately seen as scary, and there were calls to phase out this stock in favour of newer corridor carriages. I understand that interim measures were the introduction of the communication cord and a small window between compartments known as (at least according to Wikipedia) as Muller's lights. Is it just me or does that sound suspiciously like a jocular Wiki reference to the modern yoghurt? Anyway my question is when did non-corridor stock a) finally cease production and b) stop being used on national rail (or BR/big-four etc.) Some of the dates I've seen mentioned online seem too recent in my experience (1950s for a) and 1980s for b) ). I'm pretty sure I've never been in one. Did it really take ~100 years to eliminate non-corridor stock?