Hi Kevin, the BR52 is already part of default rolling stock in two liveries, Deutsche Reichsbahn and Österreichische Bundesbahn (ÖBB; austrian railways). The developers Eisenbahnwerk made a second tender variant available on their homepage as free download with donation option, scroll down to the bottom there is the download link:
http://eisenbahnwerk.de/wannentender.htmlThen there is the BR38 built by astauder available for download here:
http://rail-sim.de/railsimnew/index.php ... oad/66/338 (blue/green button on the right

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I'm no Steam fan so I haven't driven it, but the comments on the forum there are good. Might be worth a try. Just from the readme file it is not clear if any pre-built scenarios are included.
If you need any help translating just give me the link and I can point you in the right direction

Apart from these two there sadly is no other german steam and also very little other german content available at the moment. But to give the two locos the right tracks to drive on get
SADs Altenburg - Wildau route! Really beautiful modelled and some good scenarios for it available on the site, too. Easter Steam
Part 1 /
Part 2 /
Part 3 gets you on board a BR52 ;)