Isobella is a yellow lorry and part of the Pack.
She once had to deliver a piano, but she lost control and ended up dangling over of the side of a retaining wall next to the railway line. Kelly then had to rescue her.
Later, she had to collect diesel fuel for the other machines when they all ran out.
Isobella is a hard worker, but does not like getting dirty. She can also be rather cheeky and temperamental.
Isobella is painted yellow with red lining. She has the number 22 painted in red on her sides.
Isobella is based on a Sentinel DG4 steam lorry with a flat-bed behind her cab. She shares the same basis as Elizabeth.