With a brand-new chairman and president -- and a stock-split and improved dividend yield to boot -- everything seems to be going great for Westinghouse Air Brake Technologies  (NYSE:WAB) this week. Shareholders are up 60% over the past year, and the company's got one of the fastest projected growth rates in the whole railroad equipment supply industry.

But does this make "Wabtec" a good investment idea? Fool.com contributor Rich Smith isn't 100% convinced about that. Listen in, as he discusses the pluses and minuses of this best-of-breed investment.