I didn't down vote you. But, I wanted to put some views here: > if its a coal train No coal trains in India except Heritage pieces.[1] [1] - https://en.wikip

I didn't down vote you. But, I wanted to put some views here: > if its a coal train No coal trains in India except Heritage pieces.[1] [1] - https://en.wikipedia.org/wiki/Indian_Railways#Locomotives https://en.wikipedia.org/wiki/Indian_Railways#Locomotives You have a point. But, consider this: - Currently 47% kms length of the running track is electrified. They are not doing away with electrification and completely going solar. - Currently they have 5869 Diesel and 5214 electric locomotives in total. (almost 47% again.) [2] [2] - http://www.indianrailways.gov.in/railwayboard/uploads/directorate/stat_econ/IRSP_2015-16/Summary%20Sheet_Eng_pdf_pdf.pdf http://www.indianrailways.gov.in/railwayboard/uploads/direct... The Diesel ones have an Auxiliary power units to save Diesel which they are hauling around anyway now. Your point of hauling around batteries and equipment even now happens in all Diesel locos with multiple compressors and stuff. [3]. [3] - https://medhaindia.com/index.php/products/fuel-saving-solutions/auxiliary-power-unit https://medhaindia.com/index.php/products/fuel-saving-soluti... The Solar changes will mostly augment the Diesel units progressively thus strategically reducing dependence on Diesel, which India is a huge importer every year. The Strategy is twofold as they are speeding up electrification plus thus reducing the share of Diesel locos and also experimenting with Solar stuff.