The earliest reference to Mercury Tractors is in a brochure published by a firm named Bramco (1920) Ltd of Coventry, by 1932 the company had relocated to Gloucester and production continued at Gloucester until 1964 when Mercury were taken over by Dennis Brothers and production moved to Guildford. Following the takeover the trucks were badged as Dennis Mercury until 1972 when The Mercury Truck & Tractor Co Ltd was sold to Marshalls of Halifax Ltd, following the takeover the trucks were badged as Reliance Mercury.
- Alexander Chaplin
- Andrew Barclay
- Aveling and Porter
- Avonside
- Bagnall
- Beyer Peacock
- Black Hawthorn
- Brush
- Coalbrookdale
- Cockerill
- E Borrows
- E.B. Wilson
- Fletcher Jennings
- Fox Walker
- Gibb and Hogg
- Grant Ritchie
- Hawthorn
- Haydock
- Head Wrightson
- Hudswell Clarke
- Hunslet
- Kerr Stuart
- Kitson
- Manning Wardle
- Markham
- Nasmyth Wilson
- Neilson
- North British
- Peckett
- Robert Heath
- Robert Stephenson (and Hawthorn)
- Sentinel
- Sharp Stewart
- South Durham
- Stephen Lewin
- Vulcan Foundry
- Wigan Coal
- Yorkshire Engine Company
- Crane Tanks
- Fireless Locos
- AEC
- ALCO
- Andrew Barclay
- Armstrong Whitworth
- Bagnall
- Baguley Ltd
- British Thomson Houston
- Brush
- Clayton
- Cockerill
- Consett
- Dietrich
- Drewry
- English Electric
- Express Service
- FC Hibberd and Co Ltd
- Fowler
- Gaston Moyse
- GEC Traction
- General Motors
- Hawthorn Leslie
- Howard
- Hudswell Clarke
- Hunslet
- ICI
- Jung
- Kent Construction
- Kerr Stuart
- Lake and Elliot
- MaK
- Mercury
- Motor Rail Ltd
- Noord
- North British
- Orenstein und Koppel
- Peckett
- RFS Engineering
- Robert Stephenson and Hawthorn
- Rolls Royce
- Ruston Hornsby
- Schoma
- Sentinel
- SVI
- Thomas Hill
- Tractive Power
- Vollert
- Vulcan Foundry
- Werkspoor
- Yorkshire Engine Company
- ACI Elevation
- AEG
- Baguley Ltd
- BemoRail
- British Thomson Houston
- Brush
- Clayton
- CPM
- English Electric
- Express Service
- GEC
- Greenwood and Batley
- Harmill
- Hawthorn Leslie
- Hunslet
- Kerr Stuart
- Niteq
- Robert Stephenson Hawthorn
- Schalke
- Sculfort
- Siemens
- Stored Energy Technology
- Vollert
- Wickham
- Windhoff
- Zephir
- Mather and Platt
| Length | Varies |
| Width | Varies |
| Height | Varies |
| Number | Status | Note | Depot | Base | Owner | |
|---|---|---|---|---|---|---|
| 5537 | 2-2wDM | PR | Midland Railway - Butterley | PRE |
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