SDO would only be of value on the Rosslare line, Rathdrum in particular, all other routes can cope with 7 coaches which is the longest realistic set length likely to be seen.
Rosslare can take 5, but is worked as 4 so there is scope to expand capacity.
The CRR's opinion of selective door opening would be interesting as they have a zero tolerance policy, train must fit the platform.
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