Driver door operation means guards don't have to set foot on every platform, and disabled people relying on e.g. ramps start unstaffed stations can get missed.
It is also the first step to driver only operation.
I will take legal action if @northernassist @transportgovuk attempt

Another serious incident on the railways locally just days after a shocking derailment at Lewes. I am meeting with Network Rail today to understand what urgent action they are taking to ensure the safety of passengers in our area.

We are aware of the derailment of a Southern train near Lewes and are waiting to be updated.

Please allow the emergency services to do their job and refrain from speculation at this time.

Deeply concerned of reports of a derailment involving a Southern train in Lewes, Sussex.

Grateful to emergency services who are on the scene supporting those impacted.

We are working quickly with the rail industry and local partners to assist passengers.