Question: What is the total amount of Freight produced of U28C?
SQL: SELECT "Total produced" FROM "2-1140522-3" WHERE "Service" = 'Freight' AND "Builder’s Model" = 'U28C';

Question: What is the build date for PRR Class GF30a?
SQL: SELECT "Build date" FROM "2-1140522-3" WHERE "PRR Class" = 'GF30a';

Question: What is the PRR class for wheel arrangement C-C and total less than 15?
SQL: SELECT "PRR Class" FROM "2-1140522-3" WHERE "Wheel arrangement" = 'C-C' AND "Total produced" < 15.0;

Question: What was the model for PRR class of GF28a Freight?
SQL: SELECT "Builder’s Model" FROM "2-1140522-3" WHERE "Service" = 'Freight' AND "PRR Class" = 'GF28a';