During overcrowded trains, the guard can use a cab and drop down window to monitor the departure from the station. My guard a few weeks ago stopped a train after giving 2 on the buzzer as a late runner fell on the platform a landed very close next to the footstep of the train.
Platform staff cannot stop a train after departure (
https://www.gov.uk/raib-reports/accident-at-charing-cross-station). If they are stood at the back of a 8/12 car train it's highly unlikely a driver will hear their whistles particularly at busy terminus stations with conflicting whistles from other platforms regularly.
The driver on DOO services are concentrating on the track and signalling ahead once the power is selected and the train moves inches ahead. The DOO monitors will switch off at a few mph on most trains so won't see the platform.
A guard even in the vestibule can still see parts of the platforms and has the capacity to stop the train in an emergency.
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Why else would GTR and Department for Wilkinson go ahead with these OBS plans, it will save them little money. No real changes to pay or conditions.
RSSB leaked document that cited the McNulty report a lot about having no other member of staff onboard unless it was operationally necessary.
Govia removal of guards on the 'premier' Gatwick Express services and replacements with OBS didn't last long.
No OBS training on par with guards. RPIs put on a 2 day crash course on how the units work.
Fixed term contracts of 12 months for some members of staff. I.e. we have no business case to keep you at the company, goodbye.
Govia possibly bailing out of the failing GTR franchise now the DfT is under pressure from the Transport Committee and certain MPs interest in how the DfT are going to handle their
force majeure get of jail for free card because of this "unofficial action" or sickness that's caused them to exceed their
revised performance targets.