sir article ke ander jhaak ke dekhiye....saaf saaf likha huya hain....with goods train,WDG-4 loco can go upto 55-60 kmph....thats the highest limit for goods train in IR even with Electric Loco's too....lets see whether WDG-4 can go upto 100 kmph or not...its not @ all asn easy task to go 100 kmph with 4500 MT load....can cause severe damage to tracks also...