Question: What is the livery of the Steam locomotive built after 1950 with a wheel arrangement of 2-6-2?
SQL: SELECT "Livery" FROM "2-15827397-1" WHERE "Locomotive type" = 'Steam' AND "Year built" > 1950.0 AND "Wheel Arrangement" = '2-6-2';

Question: What livery belongs to the Steam Locomotive type builder that was building before 1989?
SQL: SELECT "Livery" FROM "2-15827397-1" WHERE "Year built" < 1989.0 AND "Locomotive type" = 'Steam';