A police spokesman said a decision would then be made on whether the 60-year-old man would face charges.
Harold Sheridan, 58, was killed on the TfL project – a joint venture between Skanska and GrantRail – early last month. The British Transport Police said Mr Sheridan had been “crushed by machinery”.
The incident occurred on a former surface railway route between Canning Town station and Stratford International. It is thought that the death may have been caused by an excavator’s quick hitch not being fitted correctly.
A spokesman for Skanska GrantRail had refused to comment on the arrest. Following the incident, the Strategic Forum’s new plant working group told Construction News its first priority would be to tackle the safety problems of semi-automatic quick hitches on excavators.
Chairman Colin Wood said: “Readdressing this will definitely be our first port of call.”