Vintage ICF Track Sounds with WAP4 honking - Amritha Exp. (March 21, 2022): When I boarded the Amritha Exp at Ernakulam Town, little did I realize that it was going to be an unforgettable night with scintillating track sounds and the melodious WAM4-like honking of our WAP4 loco. Not surprisingly, I hardly slept throughout the night and was busy capturing these sounds.