SwRI_Locomotive (IMAGE) Southwest Research Institute Caption Since 1990, Southwest Research Institute has evaluated new and remanufactured locomotives, conducting in-use compliance evaluations to ensure exhaust emission levels meet applicable standards. Credit Southwest Research Institute Usage Restrictions Images/Videos may be used by the public for educational and informational purposes only. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.