Kenya has opened a major new railway between the port city of Mombasa and the capital, Nairobi, 18 months early.
President Uhuru Kenyatta said during the launch that the $3.2bn (£2.5bn) Chinese-funded line signalled a new chapter in the country.
He warned that he would authorise the execution of vandals after four people were arrested damaging sections of a guardrail.
It is Kenya’s biggest infrastructure project since independence.
The 470km (290 miles) line is part of China’s Belt and Road initiative of massive global infrastructure projects.
The railway is supposed to eventually connect land-locked South Sudan, eastern Democratic Republic of Congo, Rwanda, Burundi and Ethiopia to the Indian Ocean.
Last week, Mr Kenyatta secured an additional $3.6bn from China to extend the railway line 250km (155 miles) west from the central town of Naivasha to Kisumu.