[Back to Blog](https://rebulk.com/blog) GuideRail # What Is Demurrage? How rail demurrage works, how it is calculated, and how to reduce it September 20265 min readCole Robertson, CTO at Rebulk Demurrage is a per-day charge a railroad assesses when a railcar is held at your facility beyond the free time allowed for loading or unloading. It is not a penalty for doing something wrong. It is the price of holding the railroad's equipment longer than the tariff allows, and it is one of the most common surprise costs at a rail-served terminal. ## The one-sentence definition Demurrage is the charge that accrues per car, per day, once a railcar sits past its free time at a shipper's or receiver's facility. The railroad owns the car (or controls its supply), free time is the grace period built into the tariff, and everything after that free time bills per day until the car is released. ## Free time: the grace period Free time is the number of days you get to load or unload a car before charges start. It is set by the serving railroad's tariff and can differ by car type, commodity, and location. The practical point is simple: free time is the cheapest capacity you have. Every car released inside free time costs nothing extra, and every car that slips past it starts a meter. ## Constructive placement: the clock you cannot see A car does not have to reach your dock to start accruing demurrage. When the railroad has a car ready but cannot spot it because your tracks are full or you are not ready to receive it, the car is under constructive placement, and the clock generally starts anyway. This is where a large share of surprise charges come from: the car is "waiting on you" before it ever physically arrives, and nobody at the facility is watching that clock. ## How demurrage is calculated The math is straightforward once you know the inputs: 1. **Start the clock** at actual or constructive placement. 2. **Subtract free time.** Days inside free time do not bill. 3. **Count the excess car-days** each car sits past free time. 4. **Multiply by the per-day rate** in the railroad's tariff. | Step | What it means | | --- | --- | | Placement | The car is spotted, or constructively placed, and the clock starts | | Free time | The grace-period days allowed before charges begin | | Excess car-days | Each day a car is held past free time | | Per-day rate | The tariff rate charged for each excess car-day | | Credits and debits | Some railroads let early releases offset late ones | Because rates and free time vary by railroad, treat any single number as a planning input, not a quote. You can look up free time and per-day rates with our free [railroad demurrage rates](https://rebulk.com/tools/railroad-demurrage-rates) tool, and estimate a full-year exposure in about thirty seconds with the [rail demurrage calculator](https://rebulk.com/tools/demurrage-calculator). ## How to reduce demurrage Most demurrage is not caused by a capacity shortage. It is caused by nobody knowing which car is about to cross its free-time line. The fixes follow from that: 1. **Make the clock visible.** A live per-car dwell view beats after-the-fact dispute work. 2. **Work the free time, not the invoice.** Schedule unloading against the placement date, not against whenever the crew gets to it. 3. **Avoid constructive-placement traps.** Know your real track capacity before ordering cars in, so the railroad is not holding cars the clock is already billing. 4. **Dispute with records.** Arrival, placement, and release timestamps win disputes. Facilities running on spreadsheets tend to pay charges that facilities with per-car timelines recover. ## How Rebulk helps [Rebulk's Track and Trace](https://rebulk.com/products/track-and-trace) keeps a per-car dwell clock from placement to release, flags demurrage as it accrues instead of when it lands on the railroad's invoice, and preserves the arrival, spot, and release records that make a dispute winnable. It is a live product for railcar tracking, ETAs, releases, and dwell, and it is adopted on its own or alongside the other Rebulk products. There is no onboarding fee, and billing starts at go-live. ## Frequently asked questions ### What is demurrage in rail? Demurrage is a per-day charge a railroad assesses when a railcar is held at your facility beyond the free time allowed for loading or unloading. It is the railroad's way of pricing the extra time its equipment sits with you instead of moving. ### How is demurrage calculated? The railroad counts the days a car is held past free time and multiplies the excess car-days by the per-day rate in its tariff. The clock starts at actual or constructive placement, free days run down, and every additional day bills per car. Some railroads run credit and debit systems where early releases offset late ones. ### What is constructive placement? Constructive placement is when the railroad has a car ready for you but cannot spot it because your tracks are full or you are not ready to receive it. The demurrage clock generally starts anyway, so a car can accrue charges before it ever reaches your dock. ### How much is demurrage per day? Rates are set by each railroad's tariff and vary, so check the serving road's published rates. You can look up free time and per-day rates by railroad with our free railroad demurrage rates tool and estimate your exposure with the demurrage calculator. ### How can I reduce demurrage charges? Make the clock visible so someone watches it per car, schedule unloading against the placement date rather than whenever a crew is free, avoid constructive-placement traps by tracking real track capacity before ordering cars in, and keep placement and release records so you can dispute charges with evidence instead of memory. Run your bulk terminal on one platform Whether you need to measure inventory, track railcars, process paperwork, or bill customers, Rebulk gives your team one operating record that runs from the work performed to the invoice, set up around how you already work. [Book a Demo](https://rebulk.com/contact) [Explore Customer Stories](https://rebulk.com/customer-stories) ### Related [All posts](https://rebulk.com/blog) Free Tool Rail Demurrage Calculator Estimate demurrage exposure per car and per year [Read more](https://rebulk.com/tools/demurrage-calculator) Free Tool Railroad Demurrage Rates Free time and per-day rates by railroad [Read more](https://rebulk.com/tools/railroad-demurrage-rates) Product Railcar Track & Trace Per-car dwell clocks and demurrage alerts [Read more](https://rebulk.com/products/track-and-trace) --- Source: https://rebulk.com/blog/what-is-demurrage