A man opens a gate in front of a train.
A train operator opens the gate for the customers.
You can not infer there are customers.
exists e1 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_train(x4) & n_front(x3) & Theme(e1,x2) & Actor(e1,x1) & v_open(e1) & n_gate(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_customer(x4) & n_gate(x3) & for(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_open(e1) & n_operator(x1) & of(x1,x2) & n_train(x2))