A tramway is running as normal on Thursday after part of the line had to be closed when a 9ft-wide crater was discovered beneath it. A stretch of the Midland Metro, which runs between Birmingham and Wolverhampton, was shut after the hole was found on Tuesday evening.
The company said engineers had now filled the hole.
The line between Benson Road and Birmingham Snow Hill reopened at 0630 BST on Thursday.
'Correct decision'
It means that trams are again serving metro stops at Birmingham Snow Hill, St Paul's and the Jewellery Quarter.
The problem is believed to have been caused by water erosion or the effects of past mining activity.
Spokesman Phil Bateman said: "I know that the original decision we took to suspend services on Tuesday evening was the correct decision to take.
"Safety has to be the number one priority, and there was real cause for concern at the time.
"But the good news is that we are once again running a full service, and we hope to swiftly get back to operating the reliable service that we have established a reputation for delivering."
Drains near the affected stretch of track are being checked in an effort to establish whether there is a risk of holes opening up elsewhere.
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