Push-Buttons on driver's desk of BHEL WAG7.Note the provision of BPQWC which is used to weaken the field of traction motors of the leading bogie to reduce/prevent wheel slipping.This provision is found in very few locos.Also note the dial type notch repeater provided in these locos.Usually in locos which have microprocessor control,this repeater is dispensed with. (Khalid Kagzi)