i have heard that changing subway is free,if i want to change multiple subway lines(eg,from line 5 to line 2,then from line 2 to line 4) then do i need to buy special ticket? or the same ticket which i will buy for entrance into line 5 can be used to change to subway line 2 and then to subway line 4.???
kindly clear my confusion
i will be very thankful..