NMRA Tech Committee makes Clarifications and Adjustments to Factory Stock Class Rules

The NMRA Technical Committee released new rule Clarifications/Adjustments today in Factory Stock.  Adjustments include:

  • A Clarification/Addition to the approved Cylinder Head list.

These changes go into effect immediately, unless otherwise noted in this document.

The 2020 NMRA Class Rules and all Rule Revisions/Clarifications can be found here: