This article is about
the engine. You may be looking for . the episode
is a tank engine. Her quadruplets are Dailey , Dawson , and Damian .
Dailey and her brothers first arrived in the second season. Their constant bickering got on everyone's nerves, including
's. Their 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 Dailey to work at Anopha Quarry. At first, she was nervous about working away from her brothers, as she had only ever worked with them, but she soon became friends with . That night, while staying with Jennifer at Jennifer Ffarquhar Sheds, Dailey told her how much she missed her brothers .
In the thirteenth season, Dailey attended Jacob, Sierra, and Kira's graduation party
Dailey was worried about where
and Jacob might be when they went "missing" Thomas  .
Out of her and her brothers, Dailey is usually the voice of reason and she tries to moderate the arguing between the 4 of them.
Dailey (like her brothers) does not have a real-life basis. She was designed by the Fat Controller.
Dailey is painted bright pink with red lining.
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