In a paper by Joos and Zeh, Z Phys B 59 (1985) 223, they say:
This 'coming into being of classical properties' appears related to what Heisenberg may have meant by his famous remark : 'Die "Bahn" entsteht erst dadurch, dass wir sie beobachten.'
Google Translate says this means something like 'The "train" is only created when we observe it.' Is "train" really the right translation of "Bahn" here? Should it instead be something like "trajectory?" Can anyone explain what this aphorism means, or provide a reliable translation?