During World War I there was severe rationing of fuel in the UK. This prompted individuals to convert motorcycles to run on gas from coal. As with the biodiesel motorcycles today, the machine of choice seems to have been the Royal Enfield. In that case they used the 6HP sidecar rig, towing a trailer with the balloon filled with gas,
Other entrepreneurs mounted the balloon on top of the motorcycle, making the whole thing look like a Zeppelin,
I wouldn't recommend these vehicles for use in US interstate highways. To top it all off, Royal Enfield pioneered female coal gas motorcycling as well,
incredibe !!!!
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