a) No, they make the Guard lazy. They're just a cost cutting measure to get rid of staff and a complete inconvenience to honest fare paying passengers, the majority have to suffer for the actions of the minority.
I don't buy into any of this. Even though ticket barriers prevent ticketless travel, they don't prevent people using incorrect tickets; or even people who accidentally are on the wrong train.
Let's look at Glasgow Queen Street as an example. A single ticket to nearby Ashfield costs a mere £1.40. For that, you get through the barriers and access to all nine platforms (including the two lower level platforms). This means that the passenger (accidentally or otherwise) can board a service to, say, Aberdeen (a single ticket costing a rather more pricey £40.30). The guard still has to check that the ticket held is valid for the journey.
And, on the way in to the barriered station, the guard still has the additional incentive to sell tickets so that customers are able to get through the barriers on arrival. At all times of the day, passengers will need tickets, whereas manual barriers are often only in place in the rush hour.
Then you have to consider the effectiveness of human barriers. I've passed through them plenty of times, and they frankly do not have the time to care. I've passed through with wrong tickets and seat reservations and have never been stopped. As long as it looks vaguely like a ticket, they'll let you through. (I hasten to add that I always have had a valid ticket when doing this!) And I'm not criticising the barrier staff (with the exception of the seat reservation one); they've got so many people, and they have to check so much information in such a short space of time. Humans cannot process information as quickly. Barriers tend to be more selective. You can't use a London-Bristol ticket in Aberdeen (for example). And you can't use an out of date ticket, or a seat reservation. And they also confiscate a used ticket (which human barriers seem to rarely do).
And as for staff losses to barriers; surely not a real issue? Even with automatic barriers, there's always someone on duty. And often several people are also on hand to sell tickets. If anything, staffing levels have probably increased at Glasgow Queen Street since the barriers were installed, because people need to be there all the time (and there's still lots of them in the rush hour of course).
And as for being an "inconvenience"... it's not. I think the automatic barriers at Queen Street Low Level are actually better than the human barriers were; there's less queuing on the Platform 8 stairs for example. And personally, I don't mind using ticket barriers when I know that it is an effective method of reducing fare dodging.
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Isn't there a Ring of Steel planned for Glasgow - Argyle St, High St, GCLL & Exhb Cent all being barrieired
Aye.
Here's the story. It's not 100% clear about whether they're doing Central High Level, though. That would certainly be a challenge!