CREATE TABLE table_10679 ("Line" TEXT, "Colour" TEXT, "Route" TEXT, "Length" TEXT, "Stations" FLOAT)

What is the total number of stations with a line that is u 6?
SELECT SUM("Stations") FROM table_10679 WHERE "Line" = 'u 6'
SELECT SUM("Stations") FROM "table_10679" WHERE "Line" = 'u 6'