Seoul is considering a proposal for working-level military talks with its northern neighbour to work out an accord to protect passengers.
The test runs would mark the first time trains have crossed the inter-Korean border in more than a half-century, and are a symbol of growing reconciliation between the two sides since a landmark inter-Korean summit in 2000.
Train services between the Koreas was halted in 1951, an year after the outbreak of the Korean war that ended in a cease-fire in 1953, not a peace treaty.