This may be of some help to you:
Railroad track:
kuid                                    <kuid:375451:100344>
username                                "C&IM Track Main"
istrack                                 1
trainz-build                            3.4
category-class                          "TR"
kind                                    "track"
category-era                            "1990s;2000s;2010s"
category-region                         "US"
description                             "Track used by the C & IM Railroad"