Westinghouse Air Brake Technologies (NYSE: WAB), or Wabtec, continues to feel the impact of its recent acquisition of Faiveley Transport, which is providing a revenue boost while dragging down earnings due to additional costs. However, those costs weren't the only items affecting the quarter, as a slower-than-expected ramp-up of some of its projects along with a similarly slow rebound in market conditions also weighed on results. Those factors led the company to revise its full-year guidance. Wabtec's results: The raw numbers Metric Q2 2017 Q2 2016 Year-Over-Year Change Revenue $932.3 million $723.6 million 29% Net income $72.0 million $90.5 million (20%) Adjusted EPS $0.75 $1.00 (25%) Data source: Westinghouse Air Brake Technologies Corp. Image source: Getty Images. What happened with Wabtec this quarter? The Faiveley Transport transaction continues to have a significant impact: Sales in the company's transit group soared 80% to $587.4 million thanks primarily to the acquisition of Faiveley Transport. That deal more than offset a 13% decline in sales in its freight group, which fell to $344.8 million due to lower revenue from freight car and locomotive components as well as the slower ramp-up of certain projects. In addition to that, foreign currency headwinds lopped another $15 million off the top line compared to the year-ago quarter. The weaker sales in the freight group along with $9 million, or $0.05 per share, in additional restructuring and transaction expenses relating to the Faiveley deal impacted earnings. In addition to that, interest expenses rose to $15.4 million in the quarter, up from $5 million in the year-ago quarter due to the incremental debt the company took on to close the transaction. Wabtec closed two additional deals during the quarter, buying Thermal Transfer and Semvac, which had annual sales of $25 million and $15 million, respectively The company booked several new orders during the quarter, boosting its multiyear backlog to $4.5 billion, which is up 10% from the first quarter. These new orders included more than $350 million of transit projects in Europe and Australia and $60 million in train control and signaling projects in the U.S. What management had to say CEO Raymond Belter commented on the company's results in the second quarter: We remain confident in our future growth opportunities, even as we manage aggressively through our short-term challenges. In transit, we have a record and growing backlog, with significant projects in all major markets around the world, and we are making meaningful progress in the Faiveley integration, with margins improving during the year. In freight, our backlog has now increased for three consecutive quarters, and demand appears to be stable in our key markets. Finally, we continue to invest in our balanced growth strategies, including new products and acquisitions, around the world. Rail market conditions haven't improved as quickly as Wabtec expected this year. While there are some positive signs in the market, the industry as a whole remains cautious. That uncertainty was evident in rail car maker The Greenbrier Companies' (NYSE: GBX) recently reported fiscal third-quarter results. On the positive side, Greenbrier noted that it received 11,000 rail car orders during the quarter, which boosted its backlog to 31,000. However, CEO William Furman stated, "While we see emerging improvements in North American and European rail markets, we still expect a challenging commercial environment into calendar 2018." Looking forward Given those challenges, as well as the revised timing of sales and projects already in the backlog, Wabtec is adjusting its full-year guidance. The company now anticipates that revenue will be about $3.85 billion and earnings will be $3.55 to $3.70 per share. That forecast is a bit lower than the one it provided last quarter, when it expected full-year revenue of around $4.1 billion and earnings between $3.95 and $4.15 per share. 10 stocks we like better than Westinghouse Air Brake TechnologiesWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and Westinghouse Air Brake Technologies wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of July 6, 2017Matt DiLallo has no position in any stocks mentioned. The Motley Fool recommends The Greenbrier Companies and Westinghouse Air Brake Technologies. The Motley Fool has a disclosure policy.