AxTrax 2 LF: why a low floor changes the drive layout

Useful to know

ZF's AxTrax 2 LF is an electric portal axle for low-floor buses. The manufacturer discusses compact packaging as part of making space for passengers, batteries and alternative interior layouts. [1]

A city bus drivetrain must accommodate access and interior space as well as propulsion. The axle is therefore not assessed by power alone. The useful question is how its geometry fits the low floor and complete vehicle, without drawing conclusions about every bus from a product name.