Goldstone was so far only seen in A Keystone Trip. In said episode, she was seen shunting cars, bossing around Pietersite, and later in the engine sheds.
Iolite and Angel have stated that she is very authoritative, but also very kind and friendly. It was also stated that she tends to take charge.
Goldstone is a freelance design. The design of her tender is based on Merlin and Bert's tenders.
Goldstone is painted light blue with gold lining. She has a gold bufferbeam/footplate, gold wheels, a gold dome, and black tender wheels. She also has a light blue gemstone with gold specs on her tender.