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, 2100 MHz with 20MHz and 2600 MHz with 20 MHz 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)