Question: Which prime mover had a Model of RS-18?
SQL: SELECT "Prime mover" FROM "2-1257252-3" WHERE "Model" = 'RS-18';

Question: Which model had a Specification of DL-718?
SQL: SELECT "Model" FROM "2-1257252-3" WHERE "Specification" = 'DL-718';

Question: Which power output had a Build date of 1951–1956?
SQL: SELECT "Power output" FROM "2-1257252-3" WHERE "Build date" = '1951–1956';

Question: Which wheel arrangement had a Specification of DL-700?
SQL: SELECT "Wheel arrangement" FROM "2-1257252-3" WHERE "Specification" = 'DL-700';