49 CFR Part 238- Transportation-Passenger Equipment Safety standards
Subpart B - Safety Planning and General Requirements
Section 238.103 - Fire safety.
Subtitle B - Other Regulations Relating to Transportation (Continued)
Chapter II-Federal Railroad Administration, Department of Transportation 

The following excerpt is a generic set of flammability criteria intended for passenger transit rail vehicle specifications. The requirements are based on a combined set of criteria from NFPA 130-2017, the current 49 CFR 238.103, and Appendix B to Part 238, and industry informal standards such as Boeing BSS-7239, and Bombardier Transportation SMP 800-C. 

All materials used in the vehicle shall comply with the flammability; smoke emission, toxic gas, and fire retardation requirements specified herein. 

Materials used in the construction of the vehicle shall meet the requirements contained in this section, 49 CFR 238.103, Appendix B to Part 238, and NFPA 130-2014. 

Should a conflict exist between the NFPA and Federal requirements and requirements listed elsewhere in these provisions, the more restrictive shall govern. Note: the FRP smoke requirement has been modified to a more restrictive value to improve smoke characteristics for tunnel operation. 

Materials used in the construction of the vehicle shall be selected to minimize the total combustible material content of the vehicle. 

The Contractor shall furnish a comprehensive listing of materials used in the vehicles in matrix form (flammability matrix). The flammability matrix shall include the following information as a minimum:

Material application (component description, part/drawing number, and location)
Material supplier (full name of material manufacturer)
Material description (actual material name and trade name)
Material part number, formula number, or compound number
Material weight (both density and total weight in vehicle)

Flammability data as applicable:
Flame spread / flammability
Smoke generation
Heat value per pound
Heat release rate
Total heat released
Flashpoint / autoignition temperature
Toxic content in combustion products
Testing laboratory (full name of independent testing entity)

Submittal letter (letter number(s) submitting test reports and material specifications)

Response Letter (letter(s) dispositioning the latest submission of data)

Approval status (current approval status of the specific material)

The Contractor shall submit laboratory test results for all materials, for all tests specified, including a technical data sheet, for approval. The flammability matrix shall contain sufficient information to positively identify each material listed [CDRL Requirement]. 

The material description used by the contractor shall be identical in every place it appears; test report documentation, technical data sheet, drawings, bill of materials, flammability matrix, and other related references. This documentation must be directly traceable between the technical documentation, test reports and flammability matrix, to the applicable Contractor drawings without ambiguity. 

Copies of prior test results showing that proposed materials have complied with the specified standards and tests may be submitted for approval if the test reports are no more than three years old. Assurance may be required that the material presently being considered for use is the same composition as that previously tested. 

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