为运输国家重点工程三峡—广东直流输变电工程铁路运输重量 2 90 t以下 (含 2 90 t)变压器等重、大超限设备 ,株洲车辆厂和四方车辆研究所在 D2 6 型凹底平车基础上研制了 2 90 t落下孔车。在该车的首次运用中 ,四方所对 D2 6 型 2 90 t落下孔车在运输过程中重车的动应力和动力 For the transport of key national projects Three Gorges - Guangdong DC Transmission Project railway transport weight of 2 90 t or less (including 2 90 t) transformer and other heavy and large overrun equipment, Zhuzhou Vehicle Factory and Sifang Vehicle Research Institute in the D2 6 concave flat end Based on the car developed 2 90 t drop hole car. In the first use of the car, the Quartet on the D2 6 type 2 90 t drop hole car during transport heavy truck dynamic stress and power