Can you list the names of the locations that have two or more railways?
select location from railway group by location having count ( * ) > = 2
When were those built?
select built from railway group by location having count ( * ) > = 2
What is the location of the most recently built railway?
select location from railway order by built desc limit 1
Who is the builder of the railway built earliest?
select builder from railway order by built asc limit 1
When was that railway built?
select built from railway order by built asc limit 1