This is one of the two eNodeBs for S-Bahn Hamburg LTE in the underground, located at Altona. The cells operate at 1800 MHz with 20 MHz and 2100 MHz with 10MHz channel width.
Cell 8/19 serves the following stations (and the tunnel sections in between):
Altona, Königstraße
Cell 9/20:
Reeperbahn, Landungsbrücken, Stadthausbrücke
Cell 10/21:
Jungfernstieg, Hauptbahnhof (Gleis 1+2)