EFT means fare Diff and agar Seat khali nahi rahi to aapko Penalty deni hogi agar seat khali hai to only fare Diff .
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jaise ke mujhe Surat se Mumbai Jana hai kisi SF mein to SF ka Fare BCT tak Gen mein 105 hai aur SL mein 215 hai fir aapko SL mein jana hai to aapko SF ka total fare Diff jo 110 hoga wo dena padega aur agar sear nahi rahti hai to 110+250 Penalty deni hogi