When Thomas arrived at the Steelworks, looking for Bridlington Goods Yard to deliver his trucks, Frankie, along with Hurricane, patronised Thomas so he would not leave them and that he could take a look inside the Steelworks. They began singing about how exciting the Steelworks is, to try and persuade Thomas to stay there. Their singing made Thomas feel excited about being there, and he agreed to stay there.
The following morning, Frankie and Hurricane soon put Thomas to work by convincing him that because they helped him, he should help them in return. Thomas set to work carrying molten slag out of the building and to a pit. Frankie agreed that he was very good at it, and said that he is her favourite new engine. Frankie later thanked Thomas for being there because now she and Hurricane could do more deliveries. Thomas soon wanted to go home, so Frankie, again, convinced Thomas that because he helped them, he must stay and continue to help them out, and they left him all alone in the Steelworks.
Thomas found what he thought was a way out, but he ended up derailing on some old and unused track. Soon, Frankie and Hurricane came to his rescue, both disappointed that he tried such a stunt and Frankie scolded him that he had leave them both to do all the work when they have other jobs to do if he left and Thomas was brought back to the Steelworks. Later that night, Thomas again tried breaking out of the Steelworks, ramming some flatbeds into the gate, using the cover of a thunderstorm to conceal his escape attempt. The sounds woke Frankie and Hurricane up, raising the alarm, and they immediately told him to stop, but Thomas broke through the gates and rushed away, and she and Hurricane chased after him.
Frankie and Hurricane were unable to find Thomas, but were able to find his friend James who had also come looking for him. Frankie and Hurricane later tried to convince James that the Steelworks is the place for him with their singing, but James was not convinced and demanded to know where Thomas was. They pretended that they did not know him until James pointed out that Hurricane had delivered his trucks. They realised that James had seen through their fib, and admitted they do not know where he went. James then said he must go find him, Frankie again lied that he was coming straight back, and they made him stay and get to work.
When Thomas returned to the Steelworks with three experimental engines named Lexi, Theo, and Merlin, Theo and Lexi provided a distraction to draw Frankie and Hurricane out of the Steelworks, and this allowed Thomas to slip inside unnoticed. However, Frankie and Hurricane were not taken by the distraction, and soon noticed Merlin trying to sneak inside the Steelworks to help Thomas. They followed him inside, and then saw Thomas trying to convince James to leave with him.
Seeing their two "friends" betray them, Frankie and Hurricane began forcefully attempting to make Thomas and James stay. Frankie ran straight up behind James in an attempt to derail him, but James narrowly avoided the impact. Frankie and Hurricane followed James inside and repeatedly tried to stop him, but James kept dodging their attempts. Thomas and Theo cleared James' track while Lexi and Merlin blocked Hurricane and Frankie inside, and James managed to escape the building, but the trucks Theo was pushing hit a control panel and a magnet picked Thomas up, suspending him over a vat of molten slag. Theo tried to get Thomas down, but Thomas was dropped towards the molten slag, only to be knocked away by another bucket at the last minute. Thomas hit some more ladle trucks, and the slag poured onto the floor, dangerously close to Thomas. Hurricane rocketed to Thomas' rescue, shoving him out of the way of the slag, but his back wheels were caught and began to melt. Frankie was horrified, as she did not know what to do, but thankfully, Merlin shoved Hurricane out of the slag, saving his life.
Frankie was now very unhappy, as now Hurricane was out of commission and she was about to be left alone to do all the work. James and Lexi scolded her for all that she and Hurricane have caused, and Frankie began to cry. Frankie then admitted that she only wanted someone to help her and Hurricane, as there was too much work for just the two of them, and no other engines were available or wanted to help them. Thomas got her to stop crying by saying that he knows some engines who are free to help: the experimental engines. Although reluctant at first, Theo and Lexi, with some encouragement from Thomas and Merlin, agreed to stay and help out, as does Merlin.
While Hurricane was having his wheels replaced, Lexi, Theo and Merlin started settling in with their new lives at the Steelworks helping Frankie. He then later joined in once again once his wheels were repaired.
Frankie is a charming and intelligent diesel shunter who can be very commanding. A natural leader, Frankie actively takes charge of operations at the Steelworks. She can be scheming at times, putting on a front to try and manipulate others into doing what she wants them to do.
Frankie, however, is not mean at heart. She feels hard-done-by and rejected because there is more work to do at the Steelworks than there are engines to do it. She would love to be free to go off making deliveries with Hurricane, but feels the only way she will ever be able to achieve this is by tricking others into doing the work she doesn't want to do.
Frankie is based on a Hudswell Clarke 0-6-0 diesel shunter which worked at the Manchester Ship Canal. No. 4002 Arundel Castle, affectionately known as "Billy", is preserved in working order by the East Lancashire Railway Diesel Group. Sister locomotive No. 4001 Alnwick Castle is also preserved as a static non-operational exhibit at the Winfields Store site at Rising Bridge. The American Diesels are also member of this class.
Frankie is painted blue-green and black with gold lining. She has red and gold nameplates on either sides and "M.S.C.", which stands for "Manchester Ship Canal", written above her face. The number "4002" is written in yellow on her front bufferbeam.
- 2017 - Journey Beyond Sodor
- Sophie Colquhoun (UK/US)
- Miyuki Oshima (Japan)
- Erina Yamazaki (Japan; Journey Beyond Sodor trailer only)
- Anna Sztejner (Poland)
- Liliana Barba (Latin America)
- Johanna Dost (Germany)
- Vina Papadopoulou (Greece)
- Sági Tímea (Hungary)
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- Frankie is the first engine of several things:
- The first female diesel engine in the television series since Mavis, and the first female diesel to originate in the television series instead of the Railway Series.
- The first main antagonist of a special who is female.