King Express is the second, support-type mecha (secondary robo) from the series "Mashin Sentai Kiramager" (魔進戦隊キラメイジャー, 2020-2021). This Super Sentai season was never adapted into a Power Rangers series, so King Express remained Japan-exclusive and has no official US name. The robot is formed from two so-called "Mashin": Mashin Express (魔進エクスプレス), a white, Shinkansen (bullet-train)-themed Mashin made up of the parts "Ex" and "Press," and Mashin Jouki, also romanized Jokey (魔進ジョーキー), a black steam-locomotive Mashin. Mashin Jouki was originally Crystalia's royal train, but was corrupted by the enemy Galza (of the Yodonheim faction) and deployed against the Kiramagers as the villain mecha "Smog Jokey" (a dinosaur-like form with a chainsaw on its tail). Mashin Express itself is largely non-sentient and must be piloted by the team, though it can override Galza's control of Jouki.

Combination and combat mechanics: By having Mashin Express forcibly combine with Mashin Jouki, King Express is formed, wresting control of the corrupted Mashin away from Galza. King Express is considered far more agile than the main Megazord KiramaiZin - it performs acrobatic maneuvers and can fly short distances. Its armament includes the "Jouki Chainsaw" (usually mounted on the left arm) and the "Jouki Jaws"; its finishers include the "King Express Burn Plaster," which fires energy boomerangs. As an add-on, the separately sold Mashin Zabyuun (a shark Mashin) can combine with Mashin Express to form "King Express Zabyuun."

DX toy: The set was released in 2020 (Japan, April) by Bandai (Japan) as the "Kiramager Robo Series 02 - Mashin Gattai DX King Express Set." It contains both Mashin (Express and Jouki/Jokey) and supports two display modes - the villain "Smog Jokey" and the hero robot "King Express." It is characterized by clear parts and glitter stickers (the "Kirameki" shine aesthetic) that create the look of a gleaming robot; the Mashin can also revert to their compact "Stone Mode" (Kiramei Stone). The model is predominantly plastic (ABS/PVC); any die-cast content is not confirmed. As an expansion, it is compatible with the separately sold DX Mashin Zabyuun.