Loco Motorin' is an original design by Kevin Cao that first debuted under the HW Metro subset of the Mainline in 2020. It depicts a modified locomotive on wheels in a similar vein to the Rail Rodder, but smaller and more streamlined in size. This casting has a coupling connection point tooled into the base for Thomas & Friends: Push Along models by Fisher-Price.
The first tampo of Loco Motorin' is based off of Thomas the Tank Engine from Wilbert Awdry's The Railway Series book line for the 75th anniversary of the book series.
From the back of the 2020 card:
Born: 2020, El Segundo, California
Designer: Hot Wheels®
This crazy, train themed vehicle is going off the rails, and onto the track to prove it can do more than just pull its own weight against the competition.