The 74-year-old singer has been building the model railway in his spare time for 26 years – even taking it on tour.
The pair's plans were almost ruined when Thomas Cook revealed its financial struggles before they were supposed to fly out.
The model recently shared a picture of her and Sir Rod with his first wife and two ex-girfriends as they united to celebrate daughter Kimberly's 40th birthday.
The model wife of Sir Rod Stewart broke down in tears as she recalled her experience of being bullied at school.
Stewart will now perform at the same location on 16 July after he was forced to cancel his performance due to poor weather conditions.
Rod Stewart has parted with £10,000 of his own cash to support a railway club after their annual exhibition was destroyed.