Two tram services in Sheffield remain suspended after a three-metre wide hole appeared next to the track more than a week ago.
Tests are being carried out by structural engineers at the site of the hole, which has opened up on an embankment on Park Square.
Bore holes up to 13 metres deep have been dug to assess in greater detail the hole, and South Yorkshire Passenger Transport Executive said it was awaiting the results before deciding its next step.
A shuttle bus has been put on between the Granville Road tram stop and Angel Street, in the city centre.
The blue and purple tram route services are affected between the station and the city centre until further notice.
The passenger transport executive and Supertram have both apologised to customers for any inconvenience caused – which follows on from disruption due to rail replacement works.