IMHO there were several versions/editions  of this book published in the 1950s under the title Switzerland's Amazing Railways (search for that title on Amazon).
 
I have another nice Cecil J Allen book  - Switzerland: It's railways and cableways, published circa 1967
 
http://www.amazon.co.uk/Switzerlands-amazing-railways-Cecil-Allen/dp/B0000CINLP

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