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The 35mm photographic recording unit inside 975008, part of the Derby Lightweight Ultrasonic Test Train. These recorded the results from the probes, the analysis of the film afterwards was a slow manual process restricting operation to about 2,000 miles a year. They were later replaced with magnetic tape, the digital analysis was much faster allowing yearly mileage to be increased to about 10,000 miles a year. Image courtesy of Philip C Johnson.
Type: Derby Lightweight Vehicle: 975008
Photographer: British Railways Board Views: 171
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