You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "How many miles long is this major railway link between London and Edinburgh, in which The Swinton-Doncaster line is a short railway between Swinton Junction and Doncaster South Yorkshire?" whose answer is 393 mi.
Each document should contain about 30 words, and these documents should contain useful information.

Query: length of railway link between london and edinburgh
Useful Output:

Doc 1: The fastest journey took six hours. Today, there are 28 trains each way, with average journey times of four hours 30 minutes.
Doc 2: Yes, there are direct LNER trains from Edinburgh to London with a journey that usually takes just over 4.5 hours. During the week, trains run every half hour at
Doc 3: Yes, there are direct LNER trains from London King's Cross to Edinburgh with a journey that usually takes just over four and a half hours.
Doc 4: King's Cross is the terminus for the East Coast Main Line; the 393 miles to Edinburgh are covered in 4hrs 20 minutes by the fastest trains.
Doc 5: In fact, the journey that tortuously snakes through Fife and runs for 56 miles (to travel what is only 43 miles from Scotland's oldest capital