A $150,000 road works machine was destroyed by fire in Wodonga yesterday.
The road roller, being used to build roads on railway land, was burned in South Street about 1.30am.
Detectives were yet to determine the cause and said forensic testing would determine whether the fire was arson or an electrical fault.
Anyone with information can contact police: (02) 6029 2600 or Crimestoppers: 1800 333 000.