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:
Train operator Virgin Trains East Coast provides a half-hourly frequency of trains to London King's Cross, with a journey time of about three hours, these services call at Durham, Darlington, York, Doncaster, Newark North Gate and Peterborough and north to Scotland with all trains calling at Edinburgh and a small number of trains extended to Glasgow, Aberdeen and Inverness. CrossCountry trains serve destinations in Yorkshire, the Midlands and the South West. First TransPennine Express operates services to Manchester and Liverpool. Northern Rail provides local and regional services.

Question:
How often do trains journey to King's Cross?

half-hourly