Can my friend cancel her work permit and change to visa exemption through Vientiane by train?

The user is asking if it is possible for their friend to cancel her work permit and change to a 60-day visa exemption by crossing the border to Vientiane via train. They seek clarification on where to obtain the necessary entry and exit stamps—either at Nong Khai station or through Khamsavath in Vientiane. One comment advises that the cancellation of the work permit and work extension needs to be handled at the appropriate offices within Thailand before departure.