Wads of currency notes of INR, USD, EURO is packed into container trucks and sent across the border to Pakistan by road via Wagah border (not by rail), or loaded into ships or very large crude containers (VLCC) and shipped to Karachi.
From Pakistan, the currency is then flown to Zurich,Geneva,Litchenstein, as the case may be, by PIA planes, and deposited into banks there by cash.