Player Locos in 3dzug Scenarios

This info is included in the German description (there is unfortunately no English version of the descriptions):

Extrazeit 16

player loco: VR 189 EL
Koblenz-Trier route
DTG 442 (included in Garmisch-Innsbruck "Mittenwaldbahn") for AI
Verkehrspack Güterwagen (trafficpack freightcars)
3dzug railcrane (included in the PLUS-Version of Extrazeit 16)

Reisezeit PL Mosel

player train: TSG 425
ChrisTrains Flirt 3 optional
3dzug freightcars pack
Koblenz-Trier route

Reisezeit Schwarzwald

player train: VR 111 with red bilevel cars
Stadler RS1 by christrains optional
DTG 442
3dzug trafficpack freightcars
Konstanz-Villingen route + Hausach-Villingen extension

This is the complete list of needed DLC's of the German descriptions.

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.