There are 1 train company operating 3 routes - Intercity (Sligo Branch), Enterprise, Western Suburban (Longford Branch). The cheapest train costs $25 and is 2h 26min.
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There are 3 ways to travel from NOC to DUB. 1 flight, 1 train and 1 by car are possible between the two areas. The by car from NOC to DUB is the cheapest and fastest. The train operated by Irish Rail running from Ballymote to Dublin Connolly is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!