Sorry the rolling stock pic isn't great, not quick enough - but I'd like to recommend this station (and line) in NI..
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You can hop off the Belfast - Derry line (cheap as) at a station called Bellerina and then make your way a few miles north to the get a little ferry to Inishowen from Magilligan.
There's even a beach there to camp on if you'd prefer to stay over and get the morning ferry.
A proper treat for those of us who love a train, bike, boat combo.
Just be warned the (car) drivers go everywhere like they're trying to outrun their demons (or angels)