Yes the ICRs have worked well on the Belfast line and would be the obvious candidate to operate additional services. They do perform better than than the 201s on the De-Dietrichs in the same manner as they are operational superior to the 201s on the Cork Mk4s. Comfort wise they are certainly way better than Mk4s but inferior to the De-Dietrichs and the refurbished Mk3s used by UK operators.
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