The regulator approves updated hydro plant draft concession.
The plan entails rehabilitating 9,850km of railways and setting up an open access system to attract more private operators.
In an interview with BNamericas, finance minister Lea Giménez Duarte says highways and sanitation projects are the priority.
Transport for London will bid for the contract as part of a consortium that includes French Keolis and Argentina's Corporación América.
A Colombian judge thinks it's likely that Roberto Prieto, who's being investigated for accepting bribes from the Brazilian company, could obstruct the case against him.