Skimbleshanks The Railway Cat [exclusive] -

Skimbleshanks, being the responsible and level-headed cat that he was, decided to take matters into his own paws. He began to keep a close eye on Macavity, watching as he snuck around the railway yard, causing mischief and mayhem.

You're referring to the beloved character from T.S. Eliot's "Old Possum's Book of Practical Cats"! skimbleshanks the railway cat

He patrols the corridors, checking in on the passengers to ensure there is "nothing to complain of." Eliot's "Old Possum's Book of Practical Cats"

Consider the poem’s central visual: Skimbleshanks walking down the corridor, “As he makes his rounds.” He checks the luggage, the carriage light, the passengers’ berths. This is not work—it is liturgy. Each sniff is a blessing. Each tail-switch is a benediction. Each sniff is a blessing

T.S. Eliot's inspiration for Skimbleshanks, like many of his feline characters, likely stemmed from his own experiences and observations of cats. The character has since become an integral part of the musical "Cats," with the song "Skimbleshanks: The Railway Cat" bringing his story to life on stage. The musical, composed by Andrew Lloyd Webber, premiered in 1981 and has since become a global phenomenon.