The grades of three machinery stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

WABCO Holdings’ (WBC) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Wabco Holdings manufactures and sells control systems, including advanced braking, stability, suspension, transmission control and air compressing and processing systems, that improve vehicle performance and safety and reduce overall vehicle operating costs. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Equity, Cash Flow and Margin Growth, WBC also gets A’s. Shares of WBC have increased 7.8% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of WBC stock.

American Railcar Industries, Inc. (ARII) improves from a C to a B rating this week. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. For more information, get Portfolio Grader’s complete analysis of ARII stock.

Luxfer Holdings PLC Sponsored ADR (LXFR) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Luxfer Holdings, a materials technology company, engages in the design, manufacture, and supply of materials, components, and gas cylinders. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of LXFR stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.