Sierra is a human character.


Stories From Sodor

The Search for the Controllers

In Sierra's first appearance, she, along with Jacob, Cassie, and Caroline, came to Sodor for the first time to visit Kira and her family[1]. Sometime between the special and Rosie, Jacob, Sierra, and the Troublesome Trucks, Jacob and Sierra decided to stay on Sodor.

Season 1

Later on, Sierra, Jacob, and Rosie were taking a train of stone from Anopha Quarry to Brendam. However, Jacob was very impatient, and did not wait for a brake van before leaving the quarry. Because of this, they had trouble getting up Gordon's Hill until Oliver, Cassie, and Kira came along and helped them up the hill. However, Jacob did not want to stop to uncouple Oliver, and this lead to Rosie and Oliver having an accident in Henry's Forest[2]. Sierra and Jacob later convinced Sir Topham Hatt to restore Glynn[3] and threw surprise birthday parties for Cassie[4] and Caroline[5].

Season 9

Later, Jacob and Sierra were left in charge of the North Western Railway while Richard Hatt's family went on holiday, much to the dismay of Marie and Rose[6].


Sierra is a very loving and caring girl. She is also determined and very persistent.


Sierra can almost always be found wearing either yellow or purple.


What's wrong guys?"
"Oh, nothing. We're just a little homesick."
"But, Miss Sierra, how could you be sick of a wonderful place like Sodor?"
"No, Toad homesick means that we miss our home, not that we're sick of yours."
"Oh, sorry, Mr. Jacob."
"That's alright, Toad. After, all you gave us a good laugh.

I don't think it's very wise of Mr. Hatt to leave those two immature children in charge of us."
"They're not children anymore, Marie. They're 16 now."
"And anyway, they've been on Sodor, taking care of themselves for like 3 years now. I think if they can take care of themselves for that long, then they can certainly take care of all of us for a week."
"They're still young, and they surely aren't responsible enough to take care of a railway as big as this one."
"I hate to admit it but, Marie’s right. This railway should not be left in the hand of two incompetent and irresponsible children.


  • Jacobacranmer, Sierra's creator, based her on his best friend.
  • Sierra is one of eight characters to appear in the main series and both spin-off series, with the others being Jacob, Emma, Jackie, Rebecca, Areebah, Elizabeth, and Kira.
    • Sierra is the only one of the seven to not appear in the first season of the Jacob and Friends:All Grown Up spin-off, although she is mentioned.


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