Complex sentence: For the first 7.5 kilometres the Zugspitze Railway runs as an adhesion line as far as Grainau, the first three kilometres running parallel to the Ausserfern Railway built in 1913.
Split into simpler sentences: For the first, as far as Grainau, the Zugspitze Railway runs as an adhesion line. Of this section, the first run parallel to the Ausserfern Railway, built in 1913.