Thomas, Percy and the Dragon - S3-E7
Visible crew/equipment: When James passes Percy, two studio lights and a crew member are reflected in James' paint.
Visible crew/equipment: In the scene where James pulls up beside Gordon, studio equipment is visible in the top portion of the screen.
Visible crew/equipment: When the trucks are pushing Toby, in one shot you can see a crew member's hand pushing the trucks, then it vanishes.
Edward, Trevor and the Really Useful Party - S3-E16
Visible crew/equipment: When Bertie is talking to Trevor, in one shot of Trevor, studio equipment is visible in the top left hand corner.
Answer: Breakdown trains help the engines back on track.