General Motors built the Futurliner to promote a traveling show called the "GM Parade of Progress" in the 1940s and '50s. The slippery-lined bus, which was penned by the legendary Harley Earl, is one of 12 that traveled the U.S. to show Americans the future of motoring and technology.

GM Futurliner #10, which was fully restored in 2007, recently made a trip out to the Pontiac Nationals in Norwalk, Ohio. The 30-ton, 33-foot-long bus was on display at the event, but that didn't mean that the massive antique wasn't allowed to also take a whack at the quarter mile. The 70-year-old sign of progress didn't exactly light up the tarmac, but it can hold its head up high for even finishing the run. The final time? 48 seconds at 28 mph.

Follow the jump to watch the Futurliner in (slow) motion. And no, your YouTube connection isn't running poorly... the Futurliner is powered a four-cylinder diesel engine (30 tons!) and only has a top speed of 40 miles per hour.

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