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M/c Corporation Transport ran many all day Limited Stop (LS) routes, some jointly with NWRCC and others with outlying municipalities, before they were incorporated into SELNEC. They were introduced to provide fast services to outer suburbs beyond the existing tram routes and ran LS when parallel with the trams to avoid extracting excessive revenue from them. The 3rd front blind on the city's buses, generally used for intermediate destinations, was changed to "LIMITED STOP" on these routes to warn intending passengers. Many of these services were introduced about 1930 as cross-city routes (aka Green Line in London), but were then split because of city centre congestion. Virtually none are left.
I remember the 101 from Piccadilly to Greenbrow Road, which was the fastest way from my childhood home near Southern Cemetery to the city centre. I recall it only stopped in Moss Side and Whitworth Street and took about 15 minutes for the trip; the dual carriageway Princess Road allowed fast running. The 101 still runs on essentially its original route, but is now "all stop", as most other bus routes to Wythenshawe have been withdrawn.