Shares of Plug Power(NASDAQ:PLUG) plummeted 5% in 12:30 p.m. EDT trading on the Nasdaq Tuesday. It's not hard to figure out why.

As Reuters reported this morning, General Motors(NYSE:GM) is teaming up with Wabtec(NYSE:WAB) to supply "electric batteries and hydrogen fuel cell systems" for Wabtec's train locomotives, with deliveries set to begin as early as 2023. 

Historically, of course, General Motors has stuck to building cars and trucks powered by gasoline and diesel fuel, while Plug Power forged ahead developing new power technologies reliant on fuel cells powered by hydrogen gas. In recent years, however, GM has shifted its interest toward electric propulsion -- even promising that by 2035, it will cease production of internal-combustion engine cars and produce only electric vehicles (EVs).

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