Yes, obtaining a Commercial Driver's License (CDL) is generally required to work as a yard switcher, especially when operating certain types of trucks or locomotives within rail yards. While some yard switcher positions may involve primarily moving railcars using specialized equipment that doesn't require a CDL, most employers prefer or mandate a valid CDL due to safety regulations and the need to operate heavy machinery or vehicles. Additionally, having a CDL demonstrates that you have undergone proper training and possess the necessary skills to handle large vehicles safely in a busy yard environment. Therefore, obtaining a CDL significantly enhances your qualifications and employment prospects as a yard switcher.