Under the newer A27M specification, Cromwell integrated a number of advanced features. The Meteor engine proved to be very reliable and gave the tank good mobility but some problems appeared based on the vehicle's shared heritage and significant jump in engine power. The tank was prone to throwing its tracks if track tension was not maintained properly or if it turned at too high a speed or too sharply. There were also some problems with suspension breakage, partly due to the Cromwell's high speed and it ran through a number of design changes as a result.