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1.75 miles in length
The first commercial atmospheric railway; the line ran from Kingstown (Dún Laoghaire) to Dalkey in Ireland.
William Fairbairn and Sons built a stationary steam engine at Dalkey for this line; it had a huge flywheel, 36 ft dia, and developed 110 HP at 24 rpm with a steam pressure of 40 psi. Steam was supplied by three Cornish boilers.