Sirapite is the name of the shunting locomotive at the Leiston Works Railway.
It was built as a shunting engine by Aveling and Porter in 1906 and sold to Gypsum Mines Ltd for £985. The locomotive's name came from their plaster of Paris product which they had considered calling 'PARISite' before adopting the more pleasant-sounding 'SIRAPite'.[8]
In 1929, Sirapite was sold to Garrett & Sons. It was used to perform the task of moving trucks between Garrett's two sites – the Long Shop, and the 'Top Works' which is now an industrial park near the disused station. It would also collect and deliver goods left in the exchange sidings adjacent to Leiston railway station which had been previously carried out by horses. During the movement of goods around the engine became a source of pride for the local area.[9]
A battery locomotive replaced Sirapite in 1962, and the steam locomotive was purchased by Sir William McAlpine, a well-known railway item collector – known primarily for owning Flying Scotsman and Pendennis Castle, two very famous steam locomotives from British railway history. However, Sirapite did not see the same "glitz and glamour" which it saw in Leiston – the locomotive ended up rusting away in Kent during its first years of preservation.[10]
Grants from both public and private funders saw Sirapite being returned to Leiston and she was eventually restored to full working order.
Sirapite arrived at the Mid Suffolk Light Railway on 26 April 2019. The engine was there for the Summer season of 2019 for the railway. However, due to not being fitted with vacuum braking (as it was built as a goods engine and not a locomotive for passenger services), it could not haul passenger trains. The engine arrived at the railway so it could remain on display whilst the Long shop redeveloped part of its site. The outing to the "Middy" was the first time that the engine had more space to run on which was more than a few yards on the short demonstration line at the Long Shop Museum.[11]