In the railroads complex, insiders are doing some active buying is Greenbrier Companies ( GBX), which engages in the design, manufacture, and marketing of railroad freight car equipment in North America and Europe. Insiders might have spotted some deep value here since this stock is off by 24% so far in 2012. Greenbrier Companies has a market cap of $491 million and an enterprise value of $980 million. This stock trades at a cheap valuation, with a trailing price-to-earnings of 13.45 and a forward price-to-earnings of 6.58. Its estimated growth rate for this year is 402.3%, and for next year it's pegged at 26.7%. This is far from a cash-rich company, since the total cash position on its balance sheet is $40.67 million and its total debt is $529.90 million. A director just bought 25,000 shares, or $451,000 worth of stock, at $17.45 to $18.47 per share. From a technical perspective, GBX is currently trading below both its 50-day and 200-day moving averages, which is bearish. This stock formed a triple-top earlier this year between $26.66, $26.09 and $26.28 a share. After forming that topping pattern, the stock sold off to its recent low of $16.40 a share. Since hitting that low, shares of GBX have rebounded to its current price of $18.43 a share. If you're bullish on GBX, I would only look for long-biased trades once this stock breaks out above some near-term overhead resistance at $18.82 a share with high-volume. Look for volume on that move that's near or well above its three-month average action of 570,338 shares. If we get that action soon, look for GBX to make a run at $19.91 (200-day) to $22.11 (50-day) a share. Traders should avoid GBX from the long side if it drops below that recent low of $16.40 a share with high-volume. A high-volume move below that level will mean that the recent downtrend for GBX is far from over, and the stock wants to move even lower. If you're looking to buy off weakness and anticipate the breakout, then a closer near-term support level that traders could key off of is around $18 a share. To see more stocks with notable insider buying, including Acuity Brands ( AYI), Opko Health ( OPK) and Sunrise Senior Living ( SRZ), check out the Stocks With Big Insider Buying portfolio on Stockpickr.