The Monobrake is a low-slung search and recovery utility vehicle capable of either travelling along monorail tunnels or, by using its front-mounted cahelium strengthened telescopic arm. The telescopic arm can be attached to an overhead monorail. A safety hood behind the driver/passenger seating serves as a barrier from the extreme temperatures of the jet engine.
Due to its low height, the Monobrake can drive in a monorail tunnel and have a train pass over it without incident.
- Length: 14 metres
- Power: gas turbines (ground level); jet turbines (high speed)
- Seating capacity: 1 driver and 3 passengers
- Speed: jet engine on monorail = 480 kph; caterpillar tracks on ground = 112 kph
- Weight: 3 tonnes
- Width: 5 metres
- Main article: History of the Cutaway Drawings (Classic Thunderbirds)
Only two cutaways of the Monobrake are known to exist. The first featured in Redan Thunderbirds Comics, and the other appeared in the Haynes Thunderbirds manual. Both cross-sections were illustrated by Graham Bleathman.