dual frequency locomotive

例句：

1. 1. This dual frequency locomotive can travel at twice the speed of a standard train.
   这种双频机车的行驶速度是普通火车的两倍。
2. 2.The engineer was able to control the dual frequency locomotive with ease.
   工程师能够轻松地控制这台双频机车。
3. 3.The dual frequency locomotive is designed for long-distance travel, making it ideal for carrying heavy loads.
   双频机车设计用于长途旅行，非常适合承载重物。