View Compilation Error

0_0_24471830_7578.cpp:23:6: error: no matching function for call to 'train::train()'
 }b[15];
      ^
0_0_24471830_7578.cpp:23:6: note: candidates are:
0_0_24471830_7578.cpp:16:5: note: train::train(int, int, int, int, int)
     train(int x,int y,int z,int a,int b){
     ^
0_0_24471830_7578.cpp:16:5: note:   candidate expects 5 arguments, 0 provided
0_0_24471830_7578.cpp:13:8: note: constexpr train::train(const train&)
 struct train{
        ^
0_0_24471830_7578.cpp:13:8: note:   candidate expects 1 argument, 0 provided
0_0_24471830_7578.cpp:13:8: note: constexpr train::train(train&&)
0_0_24471830_7578.cpp:13:8: note:   candidate expects 1 argument, 0 provided