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 to manipulate others into doing what she wants them to do.
But Frankie 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 an engine into doing the jobs that she doesn't want to have to do.