Rear steer axle. How does it work?

Positive steer used to describe an axle which is doing nothing more than supporting and tracking a long overhang behind two fixed axles to reduce cut in at the expense of tail sweep.
As opposed to an all steering ( rear steer ) bogie which can actually create less cut in from a much longer trailer and distance from pin to axles measurement than than that.
Unless I’ve missed something.

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