Despite operating in very different transportation industry segments, Union Pacific (NYSE: UNP) and Old Dominion Freight Lines (NASDAQ: ODFL) are two unstoppable-looking dividend growers for investors to consider.

Whereas railroad behemoth Union Pacific moves massive amounts of goods across the Western United States, Canada, and Mexico, Old Dominion hauls smaller less-than-truckload (LTL) orders through its immense network across the U.S.

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Source Fool.com