KSR = Kalka Shimla Railway. ZDM = Z stands for Narrow Gauge in Indian Railway terminology, D for diesel haulage and M means the loco was meant both for freight and passenger trains [though freight don’t run on this section]....
Dr. Ridden is the 4th author listed on the scientific paper. He is explaining the research in layperson terms. This is the kind of person to subscribe and follow. Upload/Paper/Press Release:...