The Scammell Scarab is a Breetish 3-wheeled tractor unit produced bi the truck manufacturer Scammell atween 1948 an 1967. Its name is commonly believed tae be derived frae the roondit bonnet that resembled the elytra (wing covers) o a Scarab beetle, but the name really comes frae a mair conventional soorce, Scammell's idea o the combination o an Arab horse (which the Mechanical Horse replaced in BR usage) an the wird Scammell. Sca-rab = Scarab. The offeecial Scammell Lorries Ltd advertisement film maks reference tae this. It wis extremely popular wi British Railways an ither companies which made deliveries within biggit-up auries. The Ministry o Defence an aw uised the Scarab an trailers for predominantly internal transport on lairge military bases. The Scarab wis the successor tae the earlier Scammell Mechanical Horse.