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After Rocky arrived and the Search and Rescue Centre was built, Judy and Jerome became obsolete. They remained on their siding at Knapford for several years, eventually being noticed by Ryan. Looking for a change in scenery, they had him take them to Arlesburgh Harbour. However, the sea air caused their gears to not work properly, so they asked Oliver, who was passing by, to move them somewhere else. He took them to a field on the Little Western, but they quickly grew bored there. When Duck passed by, they asked him to move them somewhere else, so he took them to the Blue Mountain Quarry. However, Daisy soon derailed on the other side of the island from the Search and Rescue Centre and Judy and Jerome were missing, meaning that Thomas would have to go all the way to the Search and Rescue Centre from Knapford to get Rocky. However, Ryan was able to track them down and bring them to Daisy. Happy to be useful again, Judy and Jerome were taken to Arlesburgh that night. Sir Topham Hatt then decided to relocate them to Arlesburgh permanently, allowing them to handle emergencies on the west side of the island while Rocky handled the east.
Judy and Jerome are both heavy sleepers, but take their jobs very seriously, usually only awaking if there is an emergency (or if they think there is). The two also seem to be very talkative. They are always ready for an emergency and respond with zeal and vigour.
Judy and Jerome are based on a Cowans Sheldon 30 ton breakdown crane.
Judy and Jerome are painted dark green-grey with yellow hazard stripes. They have brass nameplates on the sides of their cabs.
- Judy is the first female crane in the series.
- Despite being left on their siding at Knapford for years after the events of The Adventure Begins, they had not been seen on their siding again until the twentieth season.
- Judy and Jerome are the first non-human brother and sister twins in the series.