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  BASF cassette 'Security Mechanism' and history - YouTube

  http://www.youtube.com/watch?v=VUNS0KxQ8EM#t=1

  More knowlege of days gone by...

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  Rowsley turntable vacuum motor - YouTube

  https://www.youtube.com/watch?v=vIDV8tlGjtk

  The turntable is operated by a twin-cylinder vacuum motor, with the suction provided by a connection to the brake hose of locomotive 37152. A full circle was...

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