The Siemens and Halske T52 was a family of German teleprinter encryption devices used during WW2. This challenge is part of a series of new heavier challenges with T52. In this challenge, you need to recover a plaintext from T52D ciphertexts "in-depth". You are also provided with cribs for each message. The key is unknown.
Read more...

If it matters, there is a spelling error in one of the plaintexts for this challenge, and that error has now been corrected in the Project Gutenberg file. So thre is no longer an exact match for that text.