I'm needing some help finding info about the Kaiserlich

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I'm needing some help finding info about the Kaiserliche Reichspost - a sort of early postal system in the Renaissance-era Holy Roman Empire.

https://en.wikipedia.org/wiki/Kaiserliche_Reichspost

Unfortunately, there doesn't seem to be much info available in English, but it looks like there's more out there in German -- which unfortunately doesn't do me much good, but I was hoping there's someone out there with an enthusiasm for the subject.

A lot of the info I've found focuses on the nobles administering things, but I'm really looking for any info or especially images of the regular "delivery men" of the service around the late 16th century, and if they had any sort of standard uniform, emblem, whatever to indicate their status as an employee of the service. (Pic is of an English letter carrier from a 1608 source.)

Also would be interested to know how their routes would have worked: Would a deliveryman just have a route back and forth between two towns, or would they ever gradually hop from town to town across greater distances?