And it must be said that the SRT has not been considered a success, and the inane stop spacing on the SSE is one of the many criticisms that have been levied against it.
By the definition of the words, sure, but in spirit, not really.
The SRT was referred to as a glorified shuttle because there was very little credible reason why anyone would need to use the intermediate stations. You could say that the Yonge line was a shuttle between Finch and Eglinton, but that would leave out all the other possible combinations of journeys that were often made with it.