A. It is the sound of vanishing - the music as it plays itself to silence, the train as it travels away, a voice left on magnetic tape.

J. Walking with you down the platform. The 8.26 for Laramie. In the minute that's still left we have to do everything.

  I hurry ahead faster than the train. This way, for a fraction of a second, I'll see you approaching again.

A. A photograph of a ghost is sound.

J. Your face in the window...

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Anne Michaels and John Berger's Railtracks, with photographs by Tereza Stehliková, is published by Go Together Press in association with Artevents and the London Review Bookshop (from which it is available exclusively and globally)