Stake car
A stake car is a railroad flatcar equipped with vertical posts to secure bulky cargo. This text details its design, load types like lumber, pipes, and steel, and its operation.
Stake Car Functionality Securing and Moving Bulk Freight ========================================================
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Stake Car
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Selecting the Appropriate Car Type for Hauling Lumber, Pipes, and Steel Beams
For transporting long, heavy items, a bulkhead flatbed wagon is the primary choice. These vehicles offer an unobstructed, flat loading surface, typically between 60 and 89 feet long, combined with reinforced end walls to prevent longitudinal load shifting. Select a unit with a load capacity exceeding 100 tons to accommodate dense materials. The deck must feature numerous tie-down points for versatile securement options.
Transporting dimensional lumber or logs requires specific configurations. Bundled lumber, secured with high-tensile steel or polyester strapping, is best loaded onto a platform with sturdy, high bulkheads. The flat surface allows for tight packing, maximizing usable volume. A 70-foot platform wagon can accommodate between 90,000 and 110,000 board feet, depending on wood density and moisture content. Ensure the load is centered to maintain balance.
Pipes present a unique challenge due to their cylindrical shape. A standard flat-deck unit is insufficient without modifications. The optimal transport is a platform wagon equipped with fixed side posts or specialized cradles. These fixtures prevent pipes from rolling during transit. For smaller diameter pipes, pyramid stacking is a common method, with lower layers chocked and the entire load secured with over-the-top chains or straps.
Hauling structural steel beams demands the highest load capacity and structural integrity from the rolling stock. A heavy-duty flatbed, sometimes with a depressed center to lower the center of gravity, is preferable. I-beams and other structural shapes must be securely blocked and braced to prevent any movement. The concentrated weight of steel requires careful load placement directly over the bogies to avoid overstressing the wagon's frame. Always consult the vehicle's specific weight distribution diagrams before loading.
A Practical Guide to Loading and Securing Irregular Cargo on the Deck
Position the cargo's center of gravity as low as possible and centered between the transport platform's axles. For items with an offset weight distribution, like a machine with a heavy motor on one end, orient the heaviest part toward the front of the flatbed.
Initial Assessment and Placement
- Locate the center of gravity (COG). If not marked, identify the heaviest components. The COG will be closer to these parts.
- Place the load directly on the deck surface whenever feasible. Avoid elevating it on dunnage unless necessary for stability or unloading.
- Ensure the cargo does not concentrate its weight on a small point. Distribute the load over a wider area using steel plates or hardwood beams if the item has small feet or sharp edges.
- Maintain a minimum of 1 foot of clearance from the headboard to allow for tie-down access.
Building a Secure Base: Dunnage and Cribbing
Use hardwood dunnage, such as oak or maple, for blocking and bracing. Softwoods like pine can compress or split under heavy loads. The dunnage must be free of defects, knots, and decay.
- For cylindrical objects like tanks or large pipes, construct a cradle. Use a minimum of two wooden cradles, each cut to match the curve of the item. Secure the cradles to the deck with blocking and nails.
- Block the cargo against forward, backward, and lateral movement. Nail blocks directly to the wooden deck. For steel decks, weld chocks or use specialized bolt-on systems.
- The height of the blocking should be at least one-eighth of the height of the cargo it is bracing, but not less than 4 inches.
Tie-Down Strategies for Awkward Shapes
Create securement points when none are present. A belly wrap, a strap or chain passed completely underneath and over the cargo, can secure items without anchor points. For extremely unstable loads, use two belly wraps.
- Apply tie-downs in a symmetrical pattern. An “X” pattern, with straps crossing over the top of the cargo, prevents both side-to-side and forward-and-back shifting.
- Maintain a tie-down angle between 30 and 60 degrees relative to the deck. Angles below 30 degrees provide poor downward pressure, while angles above 60 degrees offer weak resistance to horizontal movement.
- Use a minimum of four separate tie-downs for any single piece of irregular cargo weighing over 1,100 pounds, with one at each corner.
Calculating Aggregate Working Load Limit (WLL)
The sum of the Working Load Limits from all securement devices must equal at least 50% of the cargo's total weight. For a 30,000-pound excavator, the aggregate WLL of all chains and binders must be at least 15,000 pounds.
- A direct tie-down, attached from the platform to the cargo, provides 50% of its WLL to the aggregate calculation.
- An indirect tie-down, passing over or through the cargo and attached at both ends to the platform, contributes its full WLL to the aggregate calculation.
- Factor in the angle of the tie-down. A strap at a 45-degree angle has its WLL contribution reduced. Check manufacturer specifications for angle-based WLL reductions.
Friction and Surface Protection
Increase the coefficient of friction between the cargo and the deck. Place high-friction rubber mats under smooth, heavy items like steel plates or machine bases to prevent sliding.
- Protect the cargo from the securement devices. Use corner protectors made of steel or dense plastic to prevent straps from cutting into the load and to protect the straps from sharp edges.
- For painted or delicate surfaces, use felt-lined or synthetic padding under chains to prevent scratching and abrasion.
Performing Pre-Trip Safety Checks on Stakes, Tie-Downs, and Braking Systems
Verify each vertical support is free of fractures, particularly at the base where it joins the platform. Check that each post seats firmly within its pocket with no excessive movement. Confirm that all locking pins or latches are present and engage securely, showing no signs of corrosion or damage that could impede their function. For wooden stanchions, inspect for deep splits or any indication of rot.
Examine the full length of all webbing straps for cuts, frays, or chemical burns. A strap with a cut exceeding 6mm along its edge must be removed from service. Inspect all load-bearing stitching for pulled or broken threads. For chain restraints, check every link for stretching, gouges, or polished wear spots that indicate a reduction in material thickness. Test ratchet binders and winches to confirm they hold tension without slipping and that their release mechanisms operate correctly.
Listen for audible air leaks around hoses, fittings, and brake chambers before departure. With the air system charged to its normal operating range of 100-125 PSI, perform a static leak test by applying full brake pressure with the engine off; the pressure drop should not exceed 3 PSI in one minute. Confirm the low-pressure warning alarm activates at or above 55 PSI. Visually inspect brake linings to ensure they are at least 6.4mm thick and check drums for any significant cracks or scoring.
Pull firmly on each slack adjuster with the brakes released. https://flabet.cloud should not surpass approximately one inch (2.5 cm). Inspect all anchor points on the flatbed, including D-rings and rub rails, for signs of cracking, deformation, or loose mounting hardware. Ensure the air compressor governor correctly cuts out and cuts in within the specified pressure range.