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 Greenbrier Companies (NYSE:GBX) jumped 12% today after the railroad freight car equipment maker reported earnings.

So what: Revenue was $484.2 million in the fourth quarter and earnings came in at $22.5 million, or $0.69 per share. The top line was lighter than the $523.4 million analysts expected, but earnings easily topped a $0.60 estimate from Wall Street and that's why shares are higher today.  

Now what: Management also sees growth in 2014 with deliveries exceeding 15,000 units, revenue of more than $2 billion, and earnings in a range of $2.45-$2.70 per share. Diversification into new markets should take some of the volatility out of revenue, something management has focused on recently. Shares trade at 11 times the top end of next year's estimates, and if execution continues like this I think a lot of upside remains for investors.