If there's so much of an issue regarding air resistance and maintenance, then Why IR isn't making all the trains AC? IR wants cost-cutting in every segment so, Why isn't they are considering this as long term investment? Those who provided us the Railways are now having the modern class Railways system but we are still lagging behind them. Why don't we go on with the concept of Garib Rath and make all the SF's a full AC(LHB) train with some budget accommodation? This will benefit the railways equally by cost-cutting in maintenance and getting good profit.