All they have did but approval from the govt. is needed. Recently they have invented as pest cleaning control measure which is going on well at bbq. Every zone is following the RSA concept then how can i hint that the other zone doesn't have rsa concept??????????? due to lack of coaches they are making this arrangement for there convinient. See falaknuma, sabari, satavahana and all had a dedicated rake prev. but now they have followed the rsa.