The source is one & only indianrail.gov.in....please look at the chart carefully,I think it'll help the members to predict their PNR's in future better.Doon Exp is such a demended train from HWH,look not even a single berth vacant....thats why there is a direct train daily b/w HWH & DDN,but no such train from SC/VSKP/MAS.It proves that population wise Kolkata is much bigger & MamataBanerjee & TMC are not introducing the trains simply..There is so much demnd,while no demand from VSKP