Assertion: locomotive's boiler | /r/HasProperty | achieved maximum working pressure
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text: When the boiler had achieved maximum working pressure, the burner would cut out until pressure had fallen to a minimum level, whereupon it would re-ignite; by this means the car could achieve around 15 miles per gallon (18.8 litres/100 km) of kerosene despite its weight in excess of 5,000 lb (2,268 kg).