Baby Bop loved this:
More info at Popular Mechanics in Is Bigger Better? 'Monster' Trains vs Freight Trains:
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Earlier this year, Union Pacific quietly ran a record-setting "monster" freight train over its Sunset Route, from Dallas to Long Beach, using the 3.5-mile-long behemoth during a one-time test of new distributed-power configurations that may help make long trains even longer. Distributed-power units (DPUs) are extra locomotives that are placed between or behind freight cars on very long trains to help them haul long, heavy loads without derailing.
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To put this in context the article says most trains are about a mile long.
(Hat tip: Instapundit)
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Technorati tags: Monster, trains
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