In 1817 Robert Hawthorn at the age of 21 began business as a general engineer and repairer of colliery machinery. With the assistance of his brother William and four workmen, his enterprise prospered and in 1820 under the trading name of R and W Hawthorn their first marine engine was built Hawthorn Leslie and Company was formed by the merger of the shipbuilder A. Leslie and Company in Hebburn with the locomotive works of R. and W. Hawthorn at St.Peter’s in Newcastle upon Tyne in 1886.
- 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
- Mather and Platt
- Niteq
- Robert Stephenson Hawthorn
- Schalke
- Sculfort
- Siemens
- Stored Energy Technology
- Vollert
- Wickham
- Windhoff
- Zephir
| Length | Varies |
| Width | Varies |
| Height | Varies |
| Number | Altnumber | Name | Status | Note | Depot | Base | Owner | |
|---|---|---|---|---|---|---|---|---|
| 3682 | 1 42 | Kearsley No.1 | Bo-BoWE | PR | East Kent Railway | PRE | ||
| 3872 | 2 | Derek Shepherd | Bo-BoWE rebuilt as Bo-BoBE | PR | Tanfield Railway | PRE | ||
| 7078 | 3 | Kearsley no.3 | Bo-BoWE | PR | Tanfield Railway | PRE |
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