The initiative was largely instigated and supported by the four largest system manufacturers (Bombardier, Siemens, Alstom and Ansaldo Breda).

 
  • 四大系统生厂商(庞巴迪、西门子、阿尔斯通、安萨尔多?布雷达)率先鼓励并支持这一标准。
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