It is understood that bus drivers affiliated to the South African Transport and Allied Workers Union (SATAWU) hung up their keys over undisclosed labour issues.
The South African Transport and Allied Workers Union has called off its strike at Transnet, ending a boycott that paralysed the state-owned logistics firm and impacted commodities exports.
Employee attendance was up across the board, averaging between 70% and 80%, with more employees expected to return over the next two days, Transnet said on Tuesday.
President Cyril Ramaphosa says he hopes the wage negotiations between Transnet and the South African Transport and Allied Workers Union will be resolved soon.