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One-man operation (OMO), also known as driver-only operation (DOO), one person operation (OPO), single person train operation (SPTO), or one-person train operation (OPTO),〔(【引用サイトリンク】title=MTA One-Person Train Operation )〕 is operation of a train, bus, or tram by the driver or motorman alone, without a conductor. On one-man operated passenger trains the driver must be able to see the whole train to make sure that all the doors are safe for departure. On curved platforms a CCTV system, mirror or station dispatch staff are required.〔 Although extra infrastructure such as cameras and mirrors might require additional investment, one-man operation is usually faster and cheaper to implement than automatic train operation, requiring a smaller investment in, for example, platform intruder detection systems and track protection (fencing, bridge-caging, CCTV etc.). In some cases, one-man operation can be seen as an intermediate step towards automatic train operation.〔 While European freight trains are normally one-man operated, the larger North American freight trains are almost exclusively manned by an engineer as well as a conductor. While one-man operation is popular and on the rise among the train operating companies as it reduces the amount of crew required and correspondingly reduces costs, it is for that reason controversial and is often strongly opposed by trade unions, often claiming that it is an unsafe practice. ==Passenger trains== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「One-man operation」の詳細全文を読む スポンサード リンク
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