IPA: //ˈsiːtreɪn//
KK: /ˈsiːtreɪn/
A type of ship designed to transport railroad cars over water.
The seatrain arrived at the port with several freight cars on board.
The word 'seatrain' is a compound of 'sea' (from Old English 'sǣ', meaning the large body of saltwater) and 'train' (from Old French 'trahiner', meaning to pull or drag). The term 'seatrain' refers to a type of freight car designed for transporting goods over water, thus combining the concepts of sea and transport.
Imagine a train that 'pulls' ('train') goods across the 'sea' — that's how 'seatrain' connects the idea of transporting items over water.