A black engineer on the London Underground had to endure monkey noises and gestures from racist workmates, a tribunal has heard.
Cameroon-born Carl Baiye, 30, claims he was ­regularly called a "n*****", including twice by his boss.
And he said two colleagues "would constantly make monkey noises and do gestures of a monkey to each other in my presence and also in front of my colleagues".
Mr Baiye, of Thornton Heath, south London, said he was told his tormenters, in Acton, wanted him fired.
Within days, the self-employed contractor says he was axed for allegedly damaging equipment.
Transport for London (TfL) denies Mr Baiye's claims of race discrimination and victimisation. It insists that no racist behaviour took place.