Outwardly they are of similar appearance to the later RENFE Class 447 design, with which they can operate with some limitations in traction and brake. Recent changes and enhancements included the addition of hustle alarms, both sound and indicator lights, for closing doors. Of the 170 units delivered, 25 have been withdrawn, including those affected by the 2004 Madrid train bombings. The units can be found operating metro type inner suburban services around Madrid, Seville, San Sebastián, Santander and Bilbao where the distances between stations is often or even less.