CREATE TABLE table_43400 ("Number" FLOAT, "Class" FLOAT, "Name" TEXT, "Livery" TEXT, "Notes" TEXT)

What is the Class when Wessex Trains Pink is the Livery?
SELECT "Class" FROM table_43400 WHERE "Livery" = 'wessex trains pink'
SELECT "Class" FROM "table_43400" WHERE "Livery" = 'wessex trains pink'