It seems like at least part of the issue on the Sligo line is the lack of a 6 car set to run the 13:05 service which is too busy for a 3 car set. The only real solution for this problem is for more capacity whether it is provided by a 6-car 22k or by adding an extra service to Mullingar or Longford at 12:05 or 14:05 which would be acceptably provided with a 29k.
How big a deal is it to extend platforms - is it really that expensive? It sounds like this would be a better solution than hacking a selective door opening solution. If SDO is something that only Irish Rail required, I could easily see this being more expensive than extending platforms.
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