I always found route 51X's routing around Clondalkin very strange. With only one departure in the morning it makes it more unique. The Dunawley terminus is funny in that no other route operates in and out of the estate. The part of the route that interests me is that in then uses the Old Nangor Road. No other route uses this road. The old route 68 use to use this road but now uses the Nangor Road. When I first seen bus stops on the Old Nangor Road I assumed they didn't remove them when the 68 moved but then eventually worked out they were there for the 51X. There is bus stops on either side of the road but there is only one bus heading inbound of a weekday morning. Maybe there was an outbound 51X using them at one point. It's one of those Dublin Bus routes that has a special away about it!
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