CREATE TABLE "general_electric" (
  "prr_class" text,
  "builder_s_model" text,
  "build_date" text,
  "total_produced" real,
  "wheel_arrangement" text,
  "service" text,
  "power_output" text
);

Question: What is the total amount of freight produced of u28c?
SQL: SELECT "total_produced" FROM "general_electric" WHERE "service"='freight' AND "builder_s_model"='u28c';

Question: What is the build date for PRR Class gf30a?
SQL: SELECT "build_date" FROM "general_electric" 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 "general_electric" WHERE "wheel_arrangement"='c-c' AND "total_produced"<15;

Question: What was the model for PRR class of gf28a freight?
SQL: SELECT "builder_s_model" FROM "general_electric" WHERE "service"='freight' AND "prr_class"='gf28a';