Origin city

δ_i ($/FEU·km)

Distance (km)

Total subsidy ($/train)

Xi’an

4.3

7117

$4.3\times 41\times 7117=1.28\times {10}^6$

Zhengzhou

5

7628

$5\times 41\times 7628=1.56\times {10}^6$