"One-One, be careful!"
This article contains spoilers. It is recommended you watch the entire show before reading this article.
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Book One - The Perennial Child[]
"The Cat's Car"[]
Following the Cat's failed attempt to trap Tulip in her own memory tape, The Conductor had the Cat's car brought closer to the Engine for an interrogation. The Conductor did not communicate directly with the Cat, but instead had the Steward talk for her. Originally, The Conductor, hiding in the shadows, ordered the Steward to grab and squeeze the Cat close to death until the Cat reminded them that only she could bring the girl and the robot to them. The Conductor decides to let the Cat go, but with a warning as to not slip up again. Before departing the car, The Conductor ordered the Steward to destroy all of the Cat's belongings as part of their ultimatum, much to the Cat's horror.
"The Ball Pit Car"[]
In her "Conductor" guise, she appears after Tulip is found and grabbed by the Steward. She claims that the "death" of One-One and Atticus was her fault and that nobody would ever get hurt if everyone stayed put in their own cars. Believing that One-One was shot and demolished, she returns to the head of the train.
"The Past Car"[]
Amelia's younger self is shown in her memory tape, as presented by the Cat. Tulip initially deduces that Alrick is the Conductor. The tape shows how Amelia and Alrick began growing closer together, eventually marrying, though at some point Alrick was killed abruptly, driving Amelia mad with grief. She entered the Infinity Train, overthrew One-One and took over as the Conductor.
"The Engine"[]
Amelia tries to stop One-One from reclaiming the train and Tulip from escaping, battling her and telling her that she isn't the only one dealing with issues. Tulip tries convincing her to make healthier decisions to help her recover from her grief, but she refuses to listen, continuously trying to keep control. However, her suit is soon destroyed, and she is ejected from it as One-One gets the Infinity Train back in his control. She laments that she will never leave the train, as her number is incredibly high, but Tulip convinces her that she has a chance and should work to make it 0 again. She nods in agreement as Tulip leaves.
Book Two - Cracked Reflection[]
"The Mall Car"[]
Although she does not make an appearance, the consequences of Amelia's time as the Conductor come into play with Grace and her gang, the Apex. The Apex, having been on the train since before Tulip arrived, believe that Amelia is the true conductor and that One-One is a usurper, and drew the red oscillating eye that appeared on her "face" as a sign of their belief. They also believe that the goal of the train is to have the highest number and commit acts to bring their numbers higher.
Book Three - Cult of the Conductor[]
"The Debutante Ball Car"[]
Amelia is mentioned by Grace and Simon. When explaining to Hazel their view of the train, Simon describes Amelia, whom he believes is the true conductor, as "a man with a big black helmet with a red wave on it," and Grace recounts how Amelia once saved her life in a car.
"The Campfire Car"[]
Amelia passes by Grace, Simon, and Hazel while venturing between the Canyon of the Golden Winged Snakes Car and the Campfire Car, although she ignores them. Upon noticing on her scanner that the car she just passed through has the corrupted code she was looking for, she immediately turns around and accuses the group of damaging the cars.
"The Canyon of the Golden Winged Snakes Car"[]
Amelia proceeds to explain the work she's been doing and notifies to the gang that she was sent by One-One. As she discovers that the gang were "victims" of the ejected car, Amelia asks for details about the situation, asking if there were objects related to her creation and attempting to sort it out about why the pulse is malfunctioning. However, when Grace realizes Hazel is the code Amelia has been tracking, she persuades Simon and Hazel to flee. Amelia gives chase but loses them due to the flying snakes, and warns them the car will eventually be ejected.
When Simon meets up with the Cat and tells her about Amelia, she reacts negatively, recalling her history with the woman and remarking she has tried to kill her more than once.
"The Hey Ho Whoa Car"[]
Amelia saves Grace and Hazel from an ambush by a Golden Winged Snake and offers them a breakfast of eggs. As she is cooking eggs, Amelia explains the situation with the car and thanks Grace for cooperating, which causes her number to go down. Grace is worried about the number decrease, yet Amelia is indifferent given that her number is still extremely high. She notes her cooking skills are less than great, only for Hazel to point out to claim she makes the best pancakes. Amelia questions how Hazel would know this as they had just met, and comments that Hazel reminds her of Alrick. Noticing her sadness, Hazel hugs the woman and claims she likes her and that she's there for her, which she brushes off.
As Amelia exits the car with Grace and Hazel from the door, Simon rushes back and charges at her, believing that Amelia is dangerous, only to be bounced back by her sound shield generated from her belt. When Simon recognizes the belt's sine wave as the sign of the "true Conductor," Amelia finally puts two and two together before pulling out her voice changer and demonstrating it, revealing she is the Conductor whom Grace encountered, although she does not remember this event. They then make their way into the Hey Ho Whoa Car, where they need to wait for the puzzle to reset before continuing. As they wait, Amelia shares her story with the group, with Simon accusing her of lying the entire time. She also reveals the point of the train is for passengers to get their numbers to zero and leave. When Simon insists that she's wrong, Amelia mocks him for being like a child and not even considering he's wrong. An enraged Simon tries to attack her, but is blocked by the sound shield, with Amelia warning she will defend herself if he does not stop. Simon continues his attack while Grace begs him to stop, until the confrontation is interrupted by a screaming Hazel, who turns into a turtle again.
Amelia realizes Hazel is the anomaly she has been tracking and recognizes Hazel is one of her attempts to recreate Alrick, although she is unsure what exactly. Noting that any car with Hazel in it when the pulse hits would be ejected, she makes plans to quarantine Hazel.
"The Origami Car"[]
Amelia reluctant to take Hazel with her
The next day, Amelia makes eggs for the group while Grace requests Hazel remain with the Apex. However, Hazel rejects this and decides she will go with Amelia instead. Amelia expresses hesitance as she does not want to be a caretaker, but eventually agrees, noting she wishes to study Hazel. The group separate at the divide between cars to wait for the pulse, which eventually comes, sending Hazel and Amelia to an unknown part of the train, leaving Simon and a devastated Grace.
"The New Apex"[]
Although she does not make a physical appearance, she is seen in one of Grace's memories as her memory of Hazel confronts her about protecting herself in a bid for control instead of defending Hazel the previous day when her true identity was revealed to Amelia and Simon.
Book Four - Duet[]
"The Twin Tapes"[]
When Amelia found the conductor, a small orb shaped robot named One in the Engine, he showed her the purpose of the Train by showing the process of two boys named Ryan Akagi and Min-Gi Park. Amelia was confused that One was processing the two boys at the same time, but One explained that his algorithm has determined that this was the best course of action, as anything can happen on the train, given enough time. As One sent the two boys off, Amelia asked what would happen if the two boys don't sort their problems out, to which One calmly claimed that they'll die.
"The Party Car"[]
Her voice is briefly heard through a Steward commending One on his decision of returning the passenger's belongings, though her remarks regarding this seem to imply that she coerced One in doing so.
"The Castle Car"[]
As time went on, Amelia begged One to create a car with Alrick in it. When he refused, she ripped him out of the engine and sent him to the Snow Car before taking his place as the new conductor. She then sent Stewards to all the passengers, including Ryan and Min-Gi, and tells them that they were "on their own now". She then removed the magnetic boots they were wearing before triggering all but one of the Stewards to explode.