CREATE TABLE table_79259 ("Railroad  ( quantity ) " CLOB, "Class" CLOB, "Road numbers" CLOB, "Builder" CLOB, "Build year" CLOB)

what is the road numbers when the class is z-7?
SELECT "Road numbers" FROM table_79259 WHERE "Class" = 'z-7'
SELECT "Road numbers" FROM "table_79259" WHERE "Class" = 'z-7'