James - this is only a recent development.
The 17:15 now has to shunt into the Longford/Edgeworthstown section before entering the yard, hence the 18:00 is now delayed in Longford until that is completed. In theory it should then reach Edgeworthstown to cross with the 18:05 on time. However, the shunt may be taking slightly longer than they reckoned, and as a result there are knock-on delays to both the 18:05 and 19:05.
As to the question why the 17:15 has to be shunted into the yard, well the 19:05 passes the 18:05 at Longford - so it would be a bit difficult to do that with the 17:15 still in the platform.
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