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Fig 1.

Photo of the Dalian metro scene.

a) Train buffer, b) Door locking device.

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Fig 2.

Optimized flow chart.

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Table 1.

The comparison of the weights.

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Table 1 Expand

Fig 3.

Safety evaluation index system of rail vehicle system.

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Fig 3 Expand

Table 2.

Calculations of the weight.

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Table 2 Expand