DA12型接触网检修作业车主要适用于接触网上部设施的日常检查、维护与保养，也可兼做牵引车辆，与其他车辆连挂进行接触网的抢修作业。
Model DA12 OCS working car is mainly used for daily inspection and maintenance of upper facilities of the overhead catenary system. It can also be used as a traction car to carry out immediate repair operation of the OCS while being connected with other vehicles.
该车为机械传动的四轴作业车，发动机额定功率为216kW，最高运行速度110km/h。 车辆后端装有液压升降回转作业平台可实现升降和左、右各120°的回转；可同时供六、七位施工人员同时在平台上作业。后端装有随车起重机可用于向作业平台吊送各种工具和器材。该车可选配静压走行系统、紧线柱、接触网检测装置。
The car is a four-axle working car using mechanical drive; its rated engine power is 216kW and the maximum traveling speed is 110km/h. The rear end of the vehicle is mounted with a hydraulic lifting and slewing operation platform able to achieve lifting and 120° slewing to left or right. It can also provide the operation space for six or seven operators at the same time on the platform. The rear end of the vehicle is mounted with a crane used for hoisting tools and equipment to the operation platform. The vehicle can be optionally equipped with hydrostatic running system, wire tightening post and OCS detection unit.
