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On January 30, 1950, Mutual Broadcasting System launched a radio adaptation, Mark Trail, featuring Matt Crowley in the title role. The 30-minute episodes aired three times weekly, and 174 episodes were produced, running until June 8, 1951. A second radio series, starring Staats Cotsworth, was broadcast on ABC beginning September 18, 1950, with 51 half-hour shows that ran thrice weekly until January 1952.

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Entertainment Radio Stations Live 24/7 Sherlock Holmes/CBS Radio Mystery Theater

https://live365.com/station/Sherlock-Holmes-Classic-Radio--a91441

https://live365.com/station/CBS-Radio-Mystery-Theater-a57491

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