That is true so far.
You need some experience with these "zeit"-packs.
Extrazeit contains solely cargo duties.
Reisezeit: only passenger service.
Fahrzeit: a mixture of both in many cases.
to make it even harder these packs differ in Versions, i. e. you can have an EL or PL pack, where a 442 is AI only and in the standard edition or a pack without these "L"-edition you have to drive it.
In many cases knowledge of the German loco numbering system can be really useful.