From a technical perspective, Westinghouse Air Brake Technologies (WAB Quick QuoteWAB - Free Report) is looking like an interesting pick, as it just reached a key level of support. WAB recently overtook the 20-day moving average, and this suggests a short-term bullish trend.

The 20-day simple moving average is a well-liked trading tool because it provides a look back at a stock's price over a 20-day period. Additionally, short-term traders find this SMA very beneficial, as it smooths out short-term price trends and shows more trend reversal signals than longer-term moving averages.

Similar to other SMAs, if a stock's price moves above the 20-day, the trend is considered positive, while price falling below the moving average can signal a downward trend.

Shares of WAB have been moving higher over the past four weeks, up 6.2%. Plus, the company is currently a Zacks Rank #2 (Buy) stock, suggesting that WAB could be poised for a continued surge.

The bullish case only gets stronger once investors take into account WAB's positive earnings estimate revisions. There have been 1 revisions higher for the current fiscal year compared to none lower, and the consensus estimate has moved up as well.

Investors should think about putting WAB on their watchlist given the ultra-important technical indicator and positive move in earnings estimate revisions.