# Stadler Rail x ABB (US Passenger Rail Traction Systems) revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Partnership: [Stadler Rail x ABB (US Passenger Rail Traction Systems)](/partnerships/stadler-rail-x-abb-us-passenger-rail-traction-systems.md)

## Recorded posture

- First recorded event: 2026-08-22
- Last material change: 2026-08-22
- Material event count: 1
- Editorial event count: 0

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

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