It surely depends on the method by which the guard controls the doors. I am not sure, for example, that on stocks where the guard has no window to look out of (e.g. Pacers, Voyagers, 156s, etc.) guard dispatch is any safer than on trains with track-to-train CCTV such as the S-Stock.
Further, a guard operating the doors takes away valuable time which could perhaps better be used for dealing with customer service or revenue issues. One problem on branch lines with unstaffed stations is that trains are occasionally delayed where the guard is still handling money when the train has stopped in the platform, or that the guard is unable to visit everyone who wishes to see him because of the requirement to operate the doors.
New mainline stock seems to built with a drop down window in the cab doors as standard (Electro/Turbostars, Desiro). Recently whilst waiting for a train, a SN 377 was departing and as the guard dispatched the train from one of the passenger doors I'm sure I spotted a small screen in the guards panel I'm not sure whether this shows the view from the outside mounted cameras or if it is purely for announcements (SN guards, any help on this matter?) These could be installed on trains without drop down windows in the cabs. It wouldn't be any safer for drivers to handle the doors on Voyagers/Pacers anyway without similiar screens to be installed but for the drivers use instead of the guard.
The punctuality of the train and operation of doors should be priority over revenue and ideally revenue would be handled by the revenue department rather than the guard if the distance between stations is so short that this problem arises.
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If that were me driving and I noticed something laying across the track, knowing that I would probably derail, I would be putting the train in to Emergency braking with my left hand and activating the GSM-R Railway Emergency Call with my right hand at the same time. Not only would all trains stop immediately in the area and adjacent areas, but the signaller would know instantly who I was and where I was roughly should I become incapacitated.
In thick fog and darkness and by the time you spotted it, say travelling at 40 - 50mph are you sure you would have enough time to react and press the right button on the radio before being sent flying by the first wheel hitting the rail? Even worse if travelling at a higher speed, for example on the 100mph Cambridge Express trains on FCC which are DOO or the fast Bedford trains running on the fast lines on the MML also at 100mph.
A guard would still be better to have on board in these circumstances as there will still be a delay between the accident happening and the emergency services reaching the scene.
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On-board staff are a lot more visible on the Scotrail trains around Glasgow (which are DOO) than on SWT suburban services (which have guards who do not generally patrol the train).
I disagree. It's better for drivers to open doors at least, as with a guard you can get a delay (frequently up north - in fact on some Northern services you know you are going to get a delay at every single station!!)
On XC Voyagers, drivers open the doors, and they don't have DOO!
A change of the rulebook whilst maintaining the same levels of safety would make it just as fast as DOO. Such as markers for the guard installed on the platform to ensure the train is platformed correctly. And like 455driver mentioned earlier in this thread a good guard would know what to look out for at every station anyway.