Once you've cleared a path to Pearse, you have have to do something with it, so you either have to park it there, or send it further south. There's only room to park two or three sets south of Pearse, so it makes sense to send them on to Brey. By limiting the number of stops, a DMU can match pace with a stopping DART, so they're not really slowing things down. The only way you could fit more DARTs through is by terminating some DMUs in Connolly (which some already do), and there's not much room to park them there either.
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