U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 23Chapter IPart 646Subpart B - Subpart B—Railroad-Highway Projects
§ 646.200 - Purpose and applicability.
§ 646.202 - [Reserved]
§ 646.204 - Definitions.
§ 646.206 - Types of projects.
§ 646.208 - Funding.
§ 646.210 - Classification of projects and railroad share of the cost.
§ 646.212 - Federal share.
§ 646.214 - Design.
§ 646.216 - General procedures.
§ 646.218 - Simplified procedure for accelerating grade crossing improvements.
§ 646.220 - Alternate Federal-State procedure.
Appendix Appendix to - Appendix to Subpart B of Part 646—Horizontal and Vertical Clearance Provisions for Overpass and Underpass Structures
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