Das Interessante Blatt was an Austrian magazine which appeared weekly from 1882 to 1939. A supplement of the newspaper appeared under the title the Wiener Bilder, their successor newspaper was the Wiener Illustrierte. 

18-05-1911, Year 1911Das interessante Blatt, No. 20, title page.  

"Gustav Mahlers returns to Vienna: The brilliant artist, who was transported from Paris to Vienna and former director of the Vienna Court Opera, in the Westbahnhof railway station bedded on a stretcher for a trip to the sanatorium (Low sanatorium). (See page 12)"

It is exactly as Alma described with reference to getting him on to the train in Paris. Presumably Carl Julius Rudolf Moll (1861-1945)Franz Chvostek Jr. (1864-1944) and Alma Mahler (1879-1964) would be in the cluster behind the stretcher, which looks grimly more like a coffin.

"Based on a photo of a Specialphotographer from 'Das interessante Blatt'". Last picture/photo.

18-05-1911, Year 1911Das interessante Blatt, No. 20, page 8.

18-05-1911, Year 1911Das interessante Blatt, No. 20, page 12 (1/2).

18-05-1911, Year 1911Das interessante Blatt, No. 20, page 12 (2/2).

The article with the photo of Gustav Mahler from 1911 extracted from the newspaper "Das interessante Blatt" (May 18, 1911), was recently found by François Letienne, a passionate Mahlerian Frenchman, who devotes his time to research in the press at the time of Mahler. His work is essential for the development of the Mahler Music Library in Paris and its department dedicated to the composer.