The technical man, actually listed as an Engineer who designed and maintained the vehicles, and wore specs, was called (Brains). He was not a member of the Tracy Family but clearly a contracting employee and cast member.
Brains - Thunderbirds - was created in 1965.
Carolina Thunderbirds was created in 1982.
Seattle Thunderbirds was created in 1977.
The Production Budget for Thunderbirds was $55,000,000.
Toyama Thunderbirds was created in 2007.
Vancouver Thunderbirds was created in 2005.
The Fabulous Thunderbirds was created in 1974.
Albuquerque Thunderbirds was created in 2005.
Albuquerque Thunderbirds ended in 2010.
UBC Thunderbirds was created in 1915.
The Hood - Thunderbirds - was created in 1965.
Thunderbirds machines was created in 1965.