Presflo

[1][2] Presflo is short for Pressure flow, and the designation came about as the design of wagon features air fluidisation, a system that pumps air into the powder under pressure to loosen it and prevent clumping, thus allowing the powder to be drained from the wagon efficiently.

Wagons operated by Tunnel Cement between Aberthaw and either Oakengates, Birmingham Curzon Street or Southampton.

[8] Traffic was originally over the North Cornwall Railway from Delabole to Tonbridge, but when that line closed in 1967, the powder was taken by lorry to Wadebridge and the wagons loaded there.

[9] During the 1970s cement was conveyed to Kishorn Yard with a Presflo wagon being attached to the rear of the Inverness to Kyle of Lochalsh passenger trains, this being used in the construction of oil rigs.

These wagons were prone to lateral oscillation, which led to a derailment at Thirsk in July 1967, with a passenger train subsequently running into the wreckage, causing 7 fatalities and the destruction of prototype locomotive DP2.

A Presflo wagon, originally used for cement powder traffic, has been preserved as part of the national collection.

Ellis Clarke Trains have announced that they will produce several O gauge ready-to-run models of the Presflo in both bauxite and grey liveries.

[25] Sodium tripolyphosphate from Albright and Wilson at Corkickle to Unilever facilities at both Port Sunlightt and Warrington, and to Procter & Gamble at West Thurrock.

[24] Lime from Hindlow[24] Sand from Oakamoor to Port Sunlight[26] Soda ash from Northwich[24] Alumina hydrate from Rogerstone to Newport[25] Trials were carried out to use the Prestwin design for carrying slag, China clay, Fuller's earth, ground limestone, Ground silica, Salt, Soda ash, Starch, and Slate powder.

[27] Airfix produced a 00 gauge kit of the diagram 1/277 version of the Prestwin,[25] which later passed to Dapol.

The colours were fictional and the design of the wagon itself, while bearing a general resemblance to the BR Prestwin, had several major differences, most notably the silhouette.