Steam wagon
（重定向自Steam lorry）
![Overtype Foden 5 ton wagon 1742 of 1908](/Images/godic/202502/13/Aa_steamlorry_astlepark5740.jpg")
![Preserved 1931-built Sentinel DG4 'undertype' steam lorry](/Images/godic/202502/13/Sentinel_DG4_registration_KF_64825740.jpg")
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A steam wagon (steam lorry or steam waggon) is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry (truck) and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler. Manufacturers tended to concentrate on one form or the other.