Question: What is the wheel arrangement of the locomotive with number 6 or 4?
SQL: SELECT "Wheel arrangement" FROM "2-1157867-2" WHERE "Number" = '6 or 4';

Question: What is the wheel arrangement for the model with 10" x 15" cylinders?
SQL: SELECT "Wheel arrangement" FROM "2-1157867-2" WHERE "Cylinders" = '10" x 15"';

Question: What is the boiler pressure for the Hesperus model?
SQL: SELECT "Boiler pressure" FROM "2-1157867-2" WHERE "Name" = 'Hesperus';

Question: What are the driving wheels of the model built in 1883?
SQL: SELECT "Driving wheels" FROM "2-1157867-2" WHERE "Date built" = '1883';