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Unread 11-07-2017, 09:36   #8
comcor
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Join Date: Dec 2005
Location: Cork-Dublin, Cork Commuter and occasionally DART and Dublin-Wexford
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Where I can think that this has been done (e.g. along the A4/A10 in Amsterdam), it's generally been to allow realignment of line in suburban areas. The trains that serve those lines don't go too fast.

The Paris-Brussels TGV line does parallel the A1 motorway for a decent distance, but if you look on a map, it's not just built in the motorway margin. It follows a much straighter line and the motorway often drifts away by as much as 300m.

If we ever considered this in Ireland, using it to rebuild an existing line doesn't seem the way to go. Maybe it could work if the M20 was ever built from Limerick to Charleville, as it would be a commuter line and cut off the Limerick Junction corner on the way to Cork, but that's really the only instance where I could imagine it working.
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