|This article is about 'the Story Library book'. You may be looking for 'the traction engine'.|
Fergus (later retitled Fergus the Good Little Engine and Thomas' Good Advice) is the thirty-sixth book in the My Thomas Story Library series.
Fergus helps Mavis, Bill, and Ben at the quarry. The twins are fed up with Fergus telling them what to do, so they plan a trick. The trick backfires and Fergus is soon up to his funnel in rocks.
- Fergus has black buffers instead of bronze buffers.
- In two illustrations, the SCC on Bill and Ben's boilers are shown in reverse order.