Table: rail_journeys_episodes_2
Columns: episode_no
episode_title
uk_broadcast_date
presenter
countries_visited

Question: What was the broadcast date of the episode that visited South Africa?
SQL: SELECT "uk_broadcast_date" FROM rail_journeys_episodes_2 WHERE "countries_visited" = 'south africa'

Question: Which country did Natalia Makarova visit?
SQL: SELECT "countries_visited" FROM rail_journeys_episodes_2 WHERE "presenter" = 'natalia makarova'

Question: What is the broadcast date for the episode titled, "From Hong Kong to Ulaanbaatar"?
SQL: SELECT "uk_broadcast_date" FROM rail_journeys_episodes_2 WHERE "episode_title" = '"from hong kong to ulaanbaatar"'

Question: What is the broadcast date for the episode titled, "St. Petersburg to Tashkent"?
SQL: SELECT "uk_broadcast_date" FROM rail_journeys_episodes_2 WHERE "episode_title" = '"st. petersburg to tashkent"'