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 industrial equipment maker Trinity Industries (NYSE: TRN) rose 18% today after releasing a strong earnings report.

So what: Revenue grew 45% from a year ago to $1.03 billion -- ahead of expectations -- and net income more than doubled to $67.5 million. That translated to earnings per share of $0.84, well ahead of the $0.73 analysts expected.

Now what: Management also said that it expected full-year earnings per share to be between $2.95 and $3.10, nearly doubling the $1.65 the company earned last year. That puts the stock at a 2012 P/E ratio of about nine; it's at the low end of estimates, and a great value for a growing company. I think shares can continue to move higher and the bump we saw today is just the start.

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