With her water tank topped up at Tan-y-Bwlch Blaenau Ffestiniog bound "Blanche" exits the east portal of Garnedd Tunnel located just upgrade from Tan-y-Bwlch station. It is one of only two tunnels along the line. The other being Moelwyn Tunnel (mole-win or bald one) located at the west end of the Tanygrisiau reservoir.