Definition & Meaning of "red rocket"in English

What does "red rocket" mean in Canadian slang?

It is used in Canada, specifically in Toronto, to refer to a classic red painted streetcar or subway train operated by the Toronto Transit Commission (TTC), especially the older models. People typically say "I caught the red rocket downtown" or "The red rocket is always packed at rush hour." The term originated in Toronto transit culture, likely in the mid 20th century, from the distinctive red color and the train's rapid movement.