Misc: Which mountain range is climbes by the worlds highest railway?

Questions

In a period of 400 years how many times does the 1st of January fall on a Sunday?

In the period 978-1016 England was ruled by which 'Unready' king?

The book 'Wamyouruijoshou' was the first to use what word?

The name 'Lego' comes from which Danish words?

What device used to be described in Greek as 'watcher of the small'?