Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of rail-industry supplier Wabtec (NYSE: WAB) chugged ahead as much as 13% in intraday trading on heavier-than-average volume.

So what: Though we still have a couple of weeks left before the first-quarter earnings onslaught, we've gotten to the point where companies either try to impress us with a better-than-expected outlook or soften the blow of ugly numbers. For Wabtec, it was most definitely the former, as the company said that it now sees 2011 earnings per share clocking in between $3.15 and $3.25, up from a previous view of $2.90. It also said that revenue growth will be 15% rather than the previously forecasted 10%.

Now what: Last week, CNBC marveled at the fact that Wabtec was the only NYSE stock to go up every year over the past decade. To be sure, that's an impressive feat given what we've gone through over that stretch. Of course, it's also been a great time for rail in general, as higher oil prices and general energy concerns have put a spotlight back on the industry. Heck, Warren Buffett even bought an entire rail company for Berkshire Hathaway (NYSE: BRK-A)(NYSE: BRK-B). But at least some of the gains for Wabtec's stock have come as the valuation multiple has risen -- in 2000, you could grab shares for less than 14 times earnings, while today you'll have to pay 26 times. It's been a great decade to own shares, and there's certainly a good company behind the stock, but I wouldn't be terribly excited about being a buyer right now.

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