Episode XIV: The Bridge of Caledonian Doom was uploaded on July 31, 2014 and is the fourth episode of the second season.
Episode 14 will begin where 13 left off. Donald and Douglas are not trusting of D199 and doubt him. However, this all changes after an incident with a bridge.
- Donald and Douglas
- Sir Topham Hatt
- Trevor (cameo)
- Fergus (cameo)
- Scruffey (cameo)
- Bill and Ben (cameo)
- Diesel 10 (cameo)
- Diesel (cameo)
- Paxton (cameo)
- Derek (cameo)
- Sidney (cameo)
- Rosie (cameo)
- Daisy (cameo)
- This episode continues where Old Reliable left off.
- The title is a parody of the "Bridge of Khazad-Dum" from the Lord of the Rings: The Fellowship of the Ring.
- This is the first episode to feature carson08022000 as Donald and Douglas.
- This episode was being produced concurrently with Episode XIII: Old Reliable.
- Music from the movie Star Wars Episode I: The Phantom Menace is used.