The problem is not necessarily that the trains now have more computing power but that the method of operating the technology has not necessarily been adequately well thought-through. SDO using GPS is vulnerable to problems at locations where the train cannot ascertain it's own location. However, this normally doesn't take too long to rectify. You just select your location from an on-screen list and the doors can then be released. It would have been better to have had platform-end beacons to control the SDO, but for various reasons (cost mostly, I suspect) it was decided not to use it. The problem is that SDO is a valuable tool for increasing capacity without which we wouldn't be able to run any 12 car trains on certain routes.
As for PASSCOM/egress problems, these are being overstated slightly. You can override them in the cab in order to get to a suitable location to deal with any problems, but eventually the train will have to stop. They need to be acknowledged in the cab and then reset locally. There is a chance that an egress could upset the door control unit which may require the door to be locked-off, but you can usually persuade them back into line.
The problem is when lots of things start happening all at the same time. As I mentioned above, PASSCOM activations or egress handles being pulled while you're grappling with the doors just makes things ten times more complicated. It may take or minute or two to achieve, but you can normally get the doors on an Electrostar open by one means or another. But start throwing in stroppy passengers pulling and pressing things they shouldn't in the train and the TCMS insists that you deal with that first because these are safety systems.
O L Leigh
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I think in discussions on here, sometimes it's easy to forget that people here have more knowledge than the average passenger. And sometimes it's worth putting yourselves in that average passengers' shoes.
Which is why I'm saying what I am. Can you see that...?
Passenger doesn't understand what's happening and is getting jittery. A driver is telling them why it's nothing to be getting their knickers in a twist over.
Remember, that average passenger will probably think of the emergency door release in the same way that they would think of an emergency exit to a building. And act accordingly if they feel trapped. It's up to the railway to make sure that they don't feel trapped.
And the average passenger would head for the fire exit in Tesco if the automatic door at the exit failed to open. It's ridiculous and doesn't equate.
O L Leigh