The 923 Doctor Yellow is the fourth Shinkalion of the Shinkansen Ultra Evolution Institute Kyoto Branch.
This Shinkalion is a 923 series with the standard livery of a Doctor Yellow.
The 923 Doctor Yellow, when transformed, becomes a humanoid mech, which still keeps it's chest the same the nose of it's shinkansen mode and has access to the Rail Gun, a rifle which can fire quick shots or change into the Trolley Blade for close combat. The 923 is also built specifically with combination with the E5 MkII in mind, and distinctively, features golden details throughout the body. Unlike the gigantic 5-cars model of the first Shinkalion Doctor Yellow, this one is a standard 2-cars shinkalion and has a Gran Cross cannon behind the nose.
- The 923 Doctor Yellow is the final new shinkalion debuting within the anime's run.
- It is the second shinkalion that is specially built for adult drivers, the first one being Shinkalion 500 Kodama.
- It is the second shinkalion based on the Shinkansen series 923 set T4.