In 1961 this Western expanded to an hour; half-hour reruns began airing under the title "Marshal Dillon"
When casting began for the TV version of Gunsmoke, Wayne recommended 
Arness, and then introduced the first episode of the then-half-hour black and 
white ... especially after it expanded to a one-hour series in 1961, Marshall Dillon 
... Arness's Matt Dillon resembled a new type of western authority that... [DOC] [TLE] Gunsmoke - Geocities [PAR] September 1955 - September 1961, Saturday 10:00-11:00 on CBS ... week in 
1955, introduced the "adult Western" to TV, and begun an enormous ... after 
being expanded to an hour, and was about to leave the air when CBS ... CBS 
aired reruns of the original half-hour version on Tuesdays under the title Marshal 
Dillon.