|This article is about a/an companion/ally who doubles as a mecha vehicle in Engine Sentai Go-Onger.|
Engine K-line (炎神ケライン Enjin Kerain?) is a hybrid of a Triceratops and a Freight Liner. He is split into two items when in storage, an Engine Cast and the number 12 Engine Soul. He serves Kyouretsu-O's left leg and Engine-O G12's left arm. Forms the back car of the train.
K-line has tremendous rushing power, and is able to break through many things with his 3 horns.He introduces himself as “Engine K-line of Light” It’s a reference to the fastest generally available train run on the Tokyo/Osaka/Fukuoka line, using the Japanese Rail Pass.