Relating to the form in which something was originally built.
2020 December 2, Richard Clinnick, “Fleet News: Anniversary run for pioneer '37' thwarted by pandemic”, inRail, page31:
It was restored to nearas-built condition by EWS ahead of theRAIL/EWS Toton Open Day in August 1998, and was withdrawn from traffic in December 1999, passing to the National Collection.