https://stradballyrailway.webs.com/locomotives.htm says No 15 is in Stradbally.
"William Spence 0-4-0 1ft 10 gauge Tank engine No 15.
The Irish Steam Preservation Societies original Steam Locomotive. It was one of 18 built to serve in the extensive 1ft 10 gauge railway in the Guinness Brewery at St James' Gate, Dublin. She was the last of the 3 strong batch to be delivered in 1895, built by William Spence of the Cork Street Foundry and Engineering Works in Dublin. She despite her size was a very powerful engine, having 2,900 lbs of Tractive effort, just under that of a Bord Na Mona Ruston and Hornsby Diesel.
The Unusual Design came about because of the Failures with the previous designs of Conventional locomotives that were in Service, usually related to dirt getting into parts on the motion. The New design, the work of Dublin born Samuel Geoeghan who served in the great Doncaster Locomotive Works in England cured these faults by mounting the cylinders on top of the boiler and this eased maintenance in the small confines of the the line.
These engines also worked 5ft 3in tracks with use of an adaptor wagon, called "Haulage Wagons", on a line was built between St James' Gate and Kingsbridge Station(now Heuston). They were well able for the work, being able to move 13 broad gauge wagons unassisted.
They were finally displaced by Diesels in the 1950s and we received No 15 in 1966, which was steamed and mounted on blocks, acted as a Sentinel on the gate of the Rally that year. Over the next two years No 15 ran a public Service along a 50 yard stretch of track with several small trucks which also came from the Guinness Factory, one of which was preserved along with the engine in the Museum.
She was replaced when No 2 became available for purchase and because she wasn't suitable for the line's tough gradients and the track played havoc with the tramway style wheels. She has remained in the Museum since, all that would be required to restore her to working order is a retube, oil to free up the cylinders and regulator gland and re-lathe the wheels.
It would be possible for this locomotive being restored to a steamable condition but it would have to run on a separate line or to build a 3ft adaptor wagon, similar to what the locomotive was originaly built for but for the Narrower 3ft Stradbally gauge.
There is some controversy about her true identity. Most railways identified Locomotives by their frames, where as Guinness went by the boilers. No 15 currently carries the Boiler of No 22, now preserved in the Cavan and Leitrim railway which is missing both a boiler and cylinders.
Other survivers include her "Batch Sister" No 13, currently in the Tywyn Wharf Station Museum in Wales. No 17 preserved at St James' Gate along with one of the Planet diesel Replacments. And No 23, along with an Adaptor Wagon in the Brockham Museum in Surrey. No 20 currently resides in The Ulster Folk and Transport Museum in Cultra, Belfast.
No.15 can be viewed at Stradbally Steam Museum a short distance from the Railway Station at Stradbally. "