You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Newcastle_upon_Tyne

Context:
There are 3 main bus companies providing services in the city; Arriva North East, Go North East and Stagecoach North East. There are two major bus stations in the city: Haymarket bus station and Eldon Square bus station. Arriva mainly operates from Haymarket Bus Station providing the majority of services to the north of Newcastle, Northumberland and North Tyneside. Go-Ahead operates from Eldon Square Bus Station, providing the majority of services south of the river in Gateshead, South Tyneside, Sunderland, and County Durham. Stagecoach is the primary operator in the city proper, with cross-city services mainly between both the West and East ends via the city centre with some services extending out to the MetroCentre, Killingworth, Wallsend and Ponteland. Bus Services in Newcastle upon Tyne and the surrounding boroughs part of the Tyne and Wear area are coordinated by Nexus, the Tyne and Wear Passenger Transport Executive.

Question:
Who is Newcastle's primary bus operator in the city proper?

Stagecoach