Mysterious Traveler (radio series)

The Mysterious Traveler is an American radio anthology series that was originally broadcast by the Mutual Broadcasting System and its affiliates from December 1943 through September 1952. The series consisted of half-hour long episodic dramas, each narrated by the titular Mysterious Traveler (Maurice Tarplin). The show was created by Robert A. Arthur, Jr. and David Kogan, who also served as producers, principal writers, and directors, and inspired a fiction magazine and a comic book series.

Format
Each episode would open with the sound of a train whistle, followed by an introduction by Maurice Taurpin as the Mysterious Traveler:

"'This is the Mysterious Traveler inviting you to join me for another journey into the realm of the strange and terrifying. I hope you will enjoy the trip and it will thrill you a little and chill you a little. So, settle back, get a good grip on your nerves, and be comfortable &mdash; if you can!'"

The story of the week would then be introduced, performed by radio actors Lyle Sudrow, Bryna Raeburn, Jackson Beck, Roger DeKoven, Bill Zuckert, Bill Johnstone, Lon Clark, Wendell Holmes, Jan Miner, Frank Readick, Joseph Julian, Elspeth Eric, Santos Ortega, Lawson Zerbe, Ann Shepherd, and others, while the sound effects were performed by Jack Amrhein, Jim Goode, Ron Harper, Walt McDonough, and Al Schaffer.

At the close of the episode, Taurpin's Mysterious Traveler would say their farewells to the listener, suggesting that they'd perhaps see them again on the train the next week at the same time.

Resources

 * https://archive.org/details/TheMysteriousTraveler
 * https://www.old-time.com/otrlogs2/tmt.log.txt
 * http://www.digitaldeliftp.com/digitaldelitoo/dd2jb-Mysterious-Traveler.html