Ernie 1 is Ernie's track inspection vehicle. He uses it to get about the Underground on his daily rounds and on his tour of the stations.
Ernie 1 is painted yellow with hazard stripes. The Underground logo is displayed on the front and sides of the vehicle. The name of the vehicle is written on both sides in black.
- In most publicity photos, Ernie 1 is depicted with a seat in the cab, but has never been seen with one in the show.
- Whenever Ernie starts or stops Ernie 1, it always makes a distinctive "beep, beep" noise.