"Can you imagine doing all that key stroking and not making errors? "
Hunt and peck... scary thought...
Unlike company service cars a variety of records were required for any car used in revenue service, including individual records for each car's maintenance, repair, modification, renumbering, rebuilding and retirement. While it is a bit easier in this day thanks to the computer age there are still many of the same records that have to be maintained and additional reports that have to be submitted to various federal agencies.
Non-revenue cars varied from road to road, with some "records" being nothing more than a transfer of assets (be it to a different owner or division, or destruction) and a letter stating that such was approved by such in such in a specific department of the railroad. Often not even renumbering records were kept, other than simply letters speaking directly of such changes.