Whats the Greatest Machine of the Sentinel Steam Waggon

STEAM POWERED WORKHORSE: the Sentinel Steam Waggon (1934) With a boiler pressure of 250 pounds per square inch (the same as a steam locomotive and five times as much as petrol lorries), the Sentinel Steam Waggon was well and truly the go to vehicle for the construction industry. Unlike conventional lorries, driving a Steam Waggon involved a baking hot fire in the cab important to be kept constantly burning by shovelling in coal (as taken care of by the stoker). The vehicle would typically travel at around 50 mph a day for up to 100 miles, which would use a vast quantity of water in order to produce the necessary amount of steam. Extra water could be derived from nearby ponds and streams and sucked up with a hose although in extreme circumstances the driver would need to seek alternate sources of water.