Bart Thomas is the light rail worker and father, 36, who 'punched a taxi driver ...

The tradie who was filmed allegedly punching a taxi driver 19 times in a shocking road rage attack in the Sydney CBD is a married father with a young child.

Concreter Bartholemew Thomas, 36, was charged this week after he allegedly assaulted a cabbie and smashed up his car in Sydney's CBD.

Thomas, from Claremont Meadows in Sydney's western suburbs, was driving his Ripa Concrete Cutting company truck, when a witness allegedly saw him jump from his vehicle and 'launch an assault on a taxi driver'.

But Thomas' workmates claimed he was reacting to the taxi driver changing lanes in front of him, forcing him to 'slam his brakes on and swerve'.

Bartholemew Thomas, 36, (pictured with his wife and young daughter) was charged this week after he allegedly assaulted a cabbie and smashed up his car in Sydney's CBD

Bartholemew Thomas, 36, (pictured with his wife and young daughter) was charged this week after he allegedly assaulted a cabbie and smashed up his car in Sydney's CBD

Mobile phone vision captured the pair allegedly hurling abuse at each other as they sat side-by-side at traffic lights at the intersection with George Street about 5.30pm on Monday.

Workmates at RIPA, with whom Thomas was working on the CBD light rail project, said he then suddenly snapped and got out of the van to approach the taxi.

Video shot by witnesses allegedly showed him then jump on the taxi's windscreen until it smashed, and then allegedly hit him through the driver's window.

Thomas allegedly threw 19 punches in quick succession until the taxi driver got out and the pair 'squared off in the middle of the road', according to witnesses. 

They fought until Thomas got the cabbie in a headlock and shocked

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