Hammer Express is one of seven stages in the game. It consists of a long, moving train on a railroad, passing by a large city in the background with many boxy buildings.
The music for the stage is Flat Attack by zeroSCAR, and the stage remains to the character Switch.
The relatively short size of the stage makes Switch's wall ride somewhat more viable at lower ball speeds while still leaving other characters' mobility options effective. Smash angles can be dangerous on this stage, especially Dice's smash angle.