A Trolleybus and a Gas Tank in the Same Picture?

I got the picture below from a European trolleybus site called "TROLLEYMOTION".  Trolley motion offers the latest trolleybus news from around the world and it also promotes the benefits of electric trolleybus transportation.  The picture below comes from a recent posting about the German city of Osnabruck.  I cannot read German so I am lost but I believe Osnabruck had trolleybus transit years ago, as did many cities in Germany.  Today, there are just a few cities that have it in Germany.  In my humble opinion, although I am not a trolleybus expert,  I believe the trolleybus is endangered by battery buses and high electric storage  buses that do not need overhead wires.  The success of what is called in America "BRT" or Bus Rapid Transit, or what is called in New York City "SBS", or Select Bus Service, is also a danger to streetcars and light rail.  My rational is, "if you do need wires or tracks, you do not need light rail, streetcars or trolleybuses".  If battery buses and BRT using non-wired buses is successful, transit organizations will not be willing to invest in tracks and overhead, unfortunately.
  Now back to the picture below.  The picture is undated, but it is coded "1966", so it must be a picture of Osnabruck in 1966.  Is that a gas tank in the background?  I have not seen many rigid style gas tank pictures from Europe.  Were they commonplace?  The flexible type of gas tank, that rose and fell according to the amount of gas stored and was guided by sort of a circular lattice framework was quite common in Europe and America around World War I.

Folks, I got a translation of the article.  It so happens that the municipality of Osnabruck  is considering to establish a new trolleybus system.  Part of this new operation will be off wire with battery operation.  See the clip below including information about the gas tank.  It is very high.

On the Old Post Road before 1972 dismantled some 75 m high disk gas tank, the trolleybuses 220 and 226 meet in August 1966 In 1960, trolleybuses had developed at that time due to the extensive road development work to be abandoned again. Recording: Thomas Johansson.

  The above comes from the news section of Trolleymotion.  The picture is from August 1966 showing two 1960 trolleybuses.  The tank is 75 meters high.  Was the trolleybus line or the gas tank dismantled in 1972?