Whilst level boarding should be the future standard, the present situation is that the system of communication (whether through an app, in-person or otherwise, between both staff and the passenger), which should have worked, failed, and not for the first time.
There will be an “investigation” taking place, but what form does this take and how will improvement be ensured? Aviation notably has a constructive approach to investigating critical safety issues which avoids unnecessary blame and instead seeks root causes and solutions. It’s notable that some in the industry earlier in this thread felt attacked at the notion that something could go wrong, seemingly since they felt blamed despite trying their best. Improvement should be the focus, not going on the defense or attack. What is the railway’s culture and approach to this?