How do natural gas and propane converted locomotives work? Are they retrofitted with spark plugs or do they use compression ignition?
Check this discussion from a little while back (with the usual wandering all around the subject): http://cs.trains.com/trn/f/741/t/253924.aspx
One method is to compress a mixture of the gas and air in a lean enough proportion that it will not ignite when compressed then inject a small amount of diesel fuel to ignite it. That's the way I understand it; others here can tell you more.
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