The ratings of 4 Machinery stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, FreightCar America, Inc.’s (RAIL) rating worsens to a D from the company’s C rating a week ago. FreightCar America, Inc. designs and manufactures aluminum and steel bodied railroad freight cars. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of RAIL stock.

This is a rough week for L.S. Starrett Company Class A (SCX). The company’s rating falls to D from the previous week’s C. L.S. Starrett Company Class A manufactures products, including tools and blades, for industrial, professional and consumer markets. The company also gets F’s in operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SCX stock.

voxeljet AG ADR (VJET) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of VJET stock.

Westport Fuel Systems, Inc. (WPRT) earns a F this week, moving down from last week’s grade of D. Westport Fuel Systems, Inc. is engaged in the research, development and marketing of high performance, low-emission engine and fuel injection systems that utilize alternative gaseous fuels such as natural gas, propane or hydrogen. The company also gets F’s in sales growth, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WPRT 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.