I have seen one of these systems in action and they work very well.
They are also starting to use these with locomotives as well, using a ginormous 10,000 gallon liquid natural gas fuel car. They are going as high as 90% natural gas/10% diesel.
CN tests natural gas/diesel fuel powered locomotives
Quote:
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The [two] retrofitted locomotives, using 90 per cent natural gas, with 10 per cent diesel fuel for ignition, are paired with a natural gas fuel tender, or specially equipped and protected tank car, between them.
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