There is also something called as top operated CBC.RDSO has mandated the modification in all electric locos. The need for top operated CBC was the damage to the operating handle in case of cattle runover and difficulty operating the handle from platform side. WAGx,WAP5/7 and diesels already have them. The side operated CBC is present only in WAP1/4 and WAM4. Of late, even these locos are being retrofitted with top operated CBC.