The 53 new green and cream-colored buses that went into service in Chicago last week looked like any other buseson the outside. But their mechanical innards were different. Instead of running on gasoline, they ran on propane gas, a petroleum distillate. They were the first of a new fleet of 500 ordered by Chicago's Transit Authority from Twin Coach Co. of Kent, Ohio. The fleet, largest of its kind in the U.S., marked the fast progress of the propane-propelled revolution in engine fuels.
Truckers and other bus companies have used propane on & off for more than 15 years, but only recently...
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