Question: What number has the builder ruston hornsby, the date 1961, and the name topsy?
SQL: SELECT COUNT("Number") FROM "2-1281645-1" WHERE "Builder" = 'ruston hornsby' AND "Date" = 1961.0 AND "Name" = 'topsy';

Question: What is the number with the builder hunslet and a works number greater than 822?
SQL: SELECT COUNT("Number") FROM "2-1281645-1" WHERE "Builder" = 'hunslet' AND "Works number" > 822.0;