You cannot 100% depend on getting an ICR on routes they are supposed to be used. The commuter Railcars are used for some services to Sligo and as Mark says, there are only sockets at the end of the cars.
These don't always work and they are also positioned in such a way that you can't really access them from a seat with a table with the exception of the seats right outside the able-bodied toilets. If you just want to charge a phone, you'll be fine on any train if you sit at the end of the car but if you want to use a 15" or bigger laptop you are probably be out of luck as it isn't really possible to manage anything bigger than a 13" on seats with power on a commuter railcar.
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