CREATE TABLE table_203_457 (id DECIMAL, "tramway" TEXT, "country" TEXT, "city" TEXT, "height of pylons" TEXT, "span width , \ leaning straight line" TEXT, "span width , \ horizontal measurement" TEXT, "height of cable over ground" TEXT, "year of inauguration" DECIMAL, "notes" TEXT)

which tramway was built directly before the 3s aeriral tramway ?
SELECT "tramway" FROM table_203_457 WHERE "year of inauguration" = (SELECT "year of inauguration" FROM table_203_457 WHERE "tramway" = '3s aerial tramway') - 1
SELECT "tramway" FROM "table_203_457" WHERE "year of inauguration" = (SELECT "year of inauguration" FROM "table_203_457" WHERE "tramway" = '3s aerial tramway') - 1