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David, nicknamed Dave, is a small blue tank engine. He is , Dailey , and Dawson 's brother.
David and his siblings first arrived in the second season. Their constant bickering got on everyone's nerves, including
's. The quadruplets' constant bickering also ended up getting them into trouble when David got buried by a rock slide Edward . Later,  , Jacob , Sierra , and Kira came to the Clay Pits to work with the quadruplets. However, their constant arguing soon began to upset Jacob. Dailey tried to get her brothers to stop arguing, even resorting to yelling at them. The four stopped quarreling for the rest of the day and now are all good friends with Jacob Cassie .
In the eleventh season,
Richard Hatt sent David to work at the Sodor Railway Museum. While working at the museum, he pulled the museum tour trains with , Thomas , Percy , Oliver , and Nia Flora .
In the thirteenth season, David attended Jacob, Sierra, and Kira's graduation party
David was worried about where
and Jacob might be when they went "missing" Thomas  .
Despite being just a little younger than his siblings, David is quite a bit smarter, but he is also rather paranoid, having many phobias, and sometimes being a bit shy. He is also a natural over-achiever, and can't stop working hard. He is determined to prove himself in the eyes of others, especially his siblings.
David (like his siblings) does not have a real-life basis. He was designed by the Fat Controller.
David is painted blue with orange lining and wheel spokes.
Episodes Sierra's Birthday Adventure | James and the New Engine | A New Friend for Rosie | Maddox and the Signal | Diesel's New Friend | Insignificant | Blisters | Twin Day | James' Day Out | Murdoch and Neville | A Dirty Day for Daniel | An Arlesdale Adventure | A Bad Day for Diesel | A Day for the Diesels | Quadruplets | Quads, Quarries, and Quarrels | Kids and Quarrels | Paige Returns | Crystal Island Adventure | Little Engines Can Do Big Things | Jack of Many Trades | Marion Makes a Move | Rosie's Old Friend | Rose's Backstory | Marie's Backstory | Dawn and Levi's Backstory | Jacob, Sierra, and Rylie's Backstory | Football | Brady and the Famous Visitor
Transcripts Sierra's Birthday Adventure/Transcript | James and the New Engine/Transcript | A New Friend for Rosie/Transcript | Maddox and the Signal/Transcript | Diesel's New Friend/Transcript | Insignificant/Transcript | Blisters/Transcript | Twin Day/Transcript | James' Day Out/Transcript | Murdoch and Neville/Transcript | A Dirty Day for Daniel/Transcript | An Arlesdale Adventure/Transcript | A Bad Day for Diesel/Transcript | A Day for the Diesels/Transcript | Quadruplets/Transcript | Quads, Quarries, and Quarrels/Transcript | Kids and Quarrels/Transcript | Paige Returns/Transcript | Crystal Island Adventure/Transcript | Little Engines Can Do Big Things/Transcript | Jack of Many Trades/Transcript | Marion Makes a Move/Transcript | Rosie's Old Friend/Transcript | Rose's Backstory/Transcript | Marie's Backstory/Transcript | Dawn and Levi's Backstory/Transcript | Jacob, Sierra, and Rylie's Backstory/Transcript | Football/Transcript | Brady and the Famous Visitor/Transcript
Episode Galleries Sierra's Birthday Adventure/Gallery | James and the New Engine/Gallery | A New Friend for Rosie/Gallery | Maddox and the Signal/Gallery | Diesel's New Friend/Gallery | Insignificant/Gallery | Blisters/Gallery | Twin Day/Gallery | James' Day Out/Gallery | Murdoch and Neville/Gallery | A Dirty Day for Daniel/Gallery | An Arlesdale Adventure/Gallery | A Bad Day for Diesel/Gallery | A Day for the Diesels/Gallery | Quadruplets/Gallery | Quads, Quarries, and Quarrels/Gallery | Kids and Quarrels/Gallery | Paige Returns/Gallery | Crystal Island Adventure/Gallery | Little Engines Can Do Big Things/Gallery | Jack of Many Trades/Gallery | Marion Makes a Move/Gallery | Rosie's Old Friend/Gallery | Rose's Backstory/Gallery | Marie's Backstory/Gallery | Dawn and Levi's Backstory/Gallery | Jacob, Sierra, and Rylie's Backstory/Gallery | Football/Gallery | Brady and the Famous Visitor/Gallery
Characters With Main Roles
| Sierra | James Ralph | | Rosie | Madison Maddox | Diesel | Rose | Dawn | Levi | | Marie | Spencer Blister I and Blister II | | Bill and Ben | Murdoch | Neville Daniel | Hank | Dailey | Dawson | Damian | David | | Jacob Paige | Mallory | Rex | Jack | Marion | James (human) |
Ralph | | Madison Rose | Dawn | Levi | | Marie | Spencer Blister I and Blister II | Daniel | Dailey | Dawson | Damian | David | Paige