The Three Tier Bridge is a single-track girder bridge with 5 stone pillars (later 2 with stone embankments at either end), introduced in the third season. It is located on Duck's Branch Line.
||Duck | Donald | Douglas | Oliver | Jackie
||Alice and Mirabel | Isabel and Dulcie | Branch Line Coaches | Express Coaches | Slip Coaches | Toad | S.C. Ruffey | Fred Pelhay | Rickety | U.L.P. | Quarry Trucks | Judy and Jerome | Hannah
||Bulgy | Algy | Skiff
||Tidmouth (Beach, Beach Village, Harbour, Hault, Hault Sheds, Tunnel, Shunting Yard, Town Square, Town Square Library, University) | Dilly's Pond | Workmen's Hut | Three Tier Bridge | Haultraugh (Bulgy's Bridge, Bulgy's Field) | Bluff's Cove | Arlesburgh (Engine Sheds, Harbour, Maritime Museum, Trading Co., West)