Rail
The sector where the documentation carries the same weight as the part. Approval processes are long, and changing supplier or routing costs more than the part does; what governs is process stability, not peak capability.
Parts typical of this sector
Bushings, axles, fastening components and drivetrain parts. Here the documentation weighs as much as the part: a stable process, dimensional control on every batch and traceability back to the heat number - asked for not at the end but from the first article.
Criteria that govern the quotation
What governs is not the tightest tolerance achievable but the consistency of the process. A process that alternates perfect parts with parts at the edge of the tolerance band costs more than one that keeps them all around nominal. Hence the usual requirements: a first-article report before the series is released, dimensional control on every batch and traceability to the heat number, agreed at the start rather than at the end. Where the part belongs to an already approved assembly, this is stated at quotation: the routing then stays fixed for the term of the contract.
Usual materials
The material groups most frequently found in this sector’s parts. What governs remains the requirement on the drawing, not the sector classification.
Usual processes
The processes this sector’s parts usually pass through.
Documentation usually required
Usual: first-article report, dimensional control on every batch, batch and heat-number traceability, 3.1 or 3.2 material certificate. Agreed before the first article.
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