This week, three Machinery stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

L.B. Foster (NASDAQ:FSTR) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. L. B. Foster manufactures, fabricates, and distributes rail and trackwork piling, highway products, earth wall systems, and tubular products. Shares of FSTR have increased 12.7% over the past month, better than the 1.2% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of FSTR stock.

Oshkosh (NYSE:OSK) improves from a C to a B rating this week. Oshkosh designs, manufactures and markets fire and emergency apparatuses and specialty commercial and military trucks. Wall Street seems to agree with the upgrade and has propelled the stock up 5.5% over the past month. For more information, get Portfolio Grader’s complete analysis of OSK stock.

Wabtec’s (NYSE:WAB) ratings are looking better this week, moving up to a B from last week’s C. Westinghouse Air Brake Technologies is a provider of value-added, technology-based products and services for the global rail industry. For more information, get Portfolio Grader’s complete analysis of WAB 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.