Tidmouth Sheds are the main engine sheds on the North Western Railway. In the Railway Series, it is shown as a shed with three or four rails leading in (the illustrations were inconsistent), but in later books it was depicted as a shed enclosing ten berths around a turntable. In the television series, the sheds were replaced by a roundhouse with a turntable at the front. Thomas, Edward, Henry, Gordon, James, Percy, and Emily sleep here. Toby, Duck, Donald, Douglas, Oliver, BoCo, Stanley, Caitlin, Flynn and Spencer have also slept here on some occasions.
The sheds have appeared in every season and special of Thomas and Friends.
During the events of Thomas and the Magic Railroad, the left side of the sheds was being repaired due to upgrades to the railway.
The sheds were later demolished and rebuilt in Calling All Engines! with a new architectural style and an extra berth for Emily. Diesel, 'Arry, and Bert were put in charge of building them, but Thomas, believing they were destroying it, sabotaged the three, causing the engines to sleep elsewhere until it was repaired.
The turntable had frozen one time due to the icy weather, and Gordon got trapped in the sheds until it was fixed.
Many events have taken place at the sheds, such as the strike of the big engines and the confrontation between Duck, Diesel, and the big engines.
- The new sheds from the later books were actually present since 1953, as in Thomas' Christmas Party it mentions "the new engine shed" and according to Rev W Awdry they were the most accurate on The Island of Sodor: Its People, History and Railways, indicating the old shed up until James and the Diesel Engines is inconsistent.
- Since the CGI switch, there seems to be a town behind the sheds.
- Almost every merchandise brand gives Tidmouth Sheds three to six berths.
- In the Railway Series, the turntable was located inside the shed and ash pits were underneath each berth.
- In some third season episodes, the interior of the shed has more than six berths, to add to that, the interior of the sheds seems to be much larger.
- A new Tidmouth Sheds model was built for Thomas and the Magic Railroad. The new model was taller than the original, and it was also used in the television series from the sixth season, up until Calling All Engines, when the sheds were rebuilt using the same design, albeit even taller and an additional berth for Emily.
- From the eighth season and onwards, the tracks inside each berth do not have any buffers.
- ERTL (discontinued)
- Wooden Railway (regular and deluxe)
- Take Along (two versions, both discontinued)
- Bachmann (shed add-on also available)
- Take-n-Play (two versions)
- Thomas Engine Collection Series (discontinued)
- Departing Now (discontinued)
- Thomas Town (discontinued)
- Mega Bloks (three versions)
- Pocket Fantasy (discontinued)
- Discover Junction
- Trading Cards
- MV Sports (with Edward; discontinued)
- Motorized Railway