Table: high_speed_rail_europe
Columns: line
speed
length
construction_begun
expected_start_of_revenue_services

Question: What is the Speed when Construction begun in 2010, and an Expected start of revenue services of 2015?
SQL: SELECT "speed" FROM high_speed_rail_europe WHERE "construction_begun" = '2010' AND "expected_start_of_revenue_services" = 2015

Question: What is the length when the expected start of revenue is more than 2017?
SQL: SELECT "length" FROM high_speed_rail_europe WHERE "expected_start_of_revenue_services" > 2017