a) Whether filters manufactured solely and principally for use by/ in Indian Railways and supplied directly to Indian Railways are classifiable under HSN Heading 8421 or under HSN Heading 8607 of the Customs Tariff (which has been borrowed for classification purposes under GST regime)?
b) Whether the aforementioned classifications of subject goods i.e. filter alter if identical goods are supplied to a distributor instead of Indian railways directly, and the distributor in turn effects supply to Indian railways?