Are me to sirf example diya ki JS jese km coaches wali train ko bhi WAP 4 milta h. Or sirf Important trains ko WAP 4 milta h ye kese possible h. Currently WAM4 are very less and WAP 4 are more in number and still the most reliable Passenger LOCO of IR. Ab to Passenger trains bhi WAP 4 se chalti h. WAP 4 ko bnaaya hi "Passenger traffic" handle krne k liye h. Yha "Passenger traffic" se mera matlab all trains except freights not Passenger Catagory trains.