Sound on tape.
"A diesel followed by yesterday's steam locomotives lay the contrasts for this journey to yesterday. Rio Grande's old seam locomotive 473 takes us from Durango to Silverton, Colorado, through the wild country where enroute we see things today as they were yesterday. Throughout this trip we feel the realism of the sound accompaniment, so tastefully a part of the picture. The maker of this film was well aware of the need to include people and human interest, and it did it well" PSA Journal, Nov. 1959, 48-49.
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