Now I think with GOC getting a few WDP 4Ds the SHF n LHF matter can come to a close. For that first KR should also have a diesel loco shed with only 4Ds and ensure all locos running in KR should have dual cabs. Diesel loco problems are for a few years until KR completes electrification of d route...
As for track factor there is not better way than constant maintenance......