Sterling Infrastructure, Inc. (STRL) , a mid-cap company, in the Zacks Engineering - R and D Services industry, has caught the attention of Wall Street with an impressive 67.2% surge in its stock price over the past three months.This rally has outpaced the industry, the broader Zacks Construction sector and the S&P 500 respectively, leading many investors to question whether the stock is still a good buy or if the rally has run its course.Sterling, a premier U.S. service provider specializing in transportat ...