NMFC 166770 - Frog Filler Blocks, Railway | Class 50

To find the correct freight class for your shipment:

1. Use the exact BOL line: “Frog Filler or Filler Blocks, railway track, iron or steel — NMFC 166770, Class 50.” No density or dimensions required for rating.
2. Package heavy fillers on 4-way pallets with hardwood dunnage, edge protectors, and two perpendicular steel bands; cap the bundle to prevent shift during transit.
3. Distribute weight evenly and keep skids under handling limits (e.g., split a 2,800 lb lot into two 1,400 lb skids) for safer LTL handling and fewer accessorials.
4. Protect machined surfaces with VCI paper or poly wrap, and mark center of gravity on taller stacks; request no-top-stack if stacks are unstable.

Note: All classifications are subject to Item 170. Verify with official NMFC publications for the most current requirements.

• Fixed Class 50 simplifies quoting and reduces reclass risk, saving dispute time and avoiding carrier correction fees.
• Dense steel hardware at Class 50 often qualifies for more favorable LTL rates, improving landed cost on track projects.
• No density calculations or dimension audits accelerate procurement cycles and enable faster spot quotes and project bids.
• Predictable classification supports FAK and contract negotiations, improving budgeting across recurring rail maintenance shipments.