Question: Which model has 175 seats?
SQL: SELECT "Model" FROM "2-1246822-2" WHERE "Seats" = 175.0;

Question: In what year was the CTC-3 model built?
SQL: SELECT "Year built" FROM "2-1246822-2" WHERE "Model" = 'CTC-3';

Question: How many seats does the BTC-5 model have?
SQL: SELECT SUM("Seats") FROM "2-1246822-2" WHERE "Model" = 'BTC-5';

Question: For the train built in 2012 with less than 179 seats, what is the Fleet ID?
SQL: SELECT "Fleet ID" FROM "2-1246822-2" WHERE "Year built" = '2012' AND "Seats" < 179.0;