This photo was taken during a specially organized tour with the topic "T3SUCS". Initially this trip was arranged before all T3SUCS will disappear from Praha, either being scrapped or being sold.
But there was a change, in the future there will be a new line 23 — to strengthen the much by touristes used line 22, which solely will run by the old classic T3SUCS. This line did not yet exist when the photo was taken, but was just applied for the special tour, for which this couple was rented.
In the future, you will still be able to use the beautiful classic Tatras — if you take line nr. 23.