11/06/2026
🍺 ENGINE SPOTLIGHT #5 – THE THORNEWILL & WARHAM BREWERY ENGINES 🍺
This Engine Spotlight focuses on a unique pair of brewery engines preserved at Markham Grange Steam Museum.
Built in 1884 by Thornewill & Warham of Burton-on-Trent, these engines were supplied to Greenall Whitley & Co. Ltd. at their brewery in Wilderspool, Warrington.
They remained in service until 1962, driving brewery machinery. Even after being retired from active work, they were maintained in good operating condition until the brewery finally closed in 1990.
The engines were generously donated to the museum in 1997.
⚙️ A PAIR OF ENGINES ⚙️
Although often referred to as a single installation, the brewery engine is actually two separate engines.
Built as works numbers 524 and 525, they were constructed side-by-side with the flywheels positioned in the centre, effectively making one engine the mirror image of the other.
Each engine can be operated independently.
⚙️ TECHNICAL DETAILS ⚙️
Builder: Thornewill & Warham, Burton-on-Trent
Year: 1884
Type: Single-cylinder horizontal engines
Cylinder Diameter: 18 inches
Stroke: 36 inches
Valves: Slide valve with an expansion valve mounted above
Flywheels:
• 8 ft 6 in diameter
• 25 inches wide
• Cast in two halves and bolted to the crankshaft
⚙️ HOW THEY WORKED ⚙️
The engines originally drove a line shaft located above the cylinders using a 12-inch-wide flat belt.
Power to the brewery machinery was engaged and disengaged by moving the belt sideways between:
• A fixed pulley
• A loose pulley
This arrangement explains the unusually wide 25-inch flywheels fitted to both engines.
The maximum speed of each engine is controlled by a Porter governor, operating through a linkage connected to the steam throttle valve.
The valve gear is driven by two eccentrics mounted on a separate shaft. This shaft is driven from a 46-inch diameter crank disc by drag links.
Steam cut-off can be adjusted manually using a handwheel, which changes the position of the eccentric rod within a slotted link, altering the travel of the expansion valve and therefore the point of cut-off.
📜 PRESERVATION 📜
After arriving at Markham Grange Steam Museum, the engines were restored to operation and became popular exhibits.
Until 2021, they were operated on steam. Following the loss of the museum’s steam supply, they are now demonstrated using low pressure air.
Recently, Brewery Engine No. 1 ran for the first time since 2021 following extensive work by museum volunteers.
📍 VISITING
The Thornewill & Warham Brewery Engines can be seen at Markham Grange Steam Museum, where they form part of one of the largest collections of preserved stationary steam engines in the United Kingdom.
More Engine Spotlights to follow.