{"uid":"cap_bJLV8t1J7PWB_kpdT7B4H","slug":"sitecheck-trade-energy-us-rail-freight-traffic-fred-7f6763bc","name":"SiteCheck Trade & Energy – US Rail Freight Traffic (FRED)","description":"US Class I rail traffic: carloads or intermodal units per period from FRED (series RAILFRTCARLOADSD11 / RAILFRTINTERMODALD11, AAR data), latest values and recent history. National totals only: there is no corridor-by-corridor status in this source.","url":"https://api.tradeenergy-api.workers.dev/api/logistics/rail-freight-corridor?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"months":{"type":"string","description":"1 to 60 recent observations (default 6)"},"series":{"type":"string","description":"carloads or intermodal (default carloads)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"latest":{"date":"2026-07-01","value":992923},"series":"RAILFRTCARLOADSD11","source":"https://fred.stlouisfed.org/series/RAILFRTCARLOADSD11","history":[{"date":"2026-07-01","value":992923},{"date":"2026-06-01","value":990656}],"measure":"carloads","checkedAt":"2026-10-23T09:37:58.661Z"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qawMruqvffqqNlXa1YIBm","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns US Class I railroad carload or intermodal unit counts from FRED (AAR data), including the latest value and recent monthly history.","exampleAgentPrompt":"Can you pull the last 12 months of US Class I railroad carload data from FRED and show me the trend?","exampleUseCases":[{"title":"Monthly freight volume trend check","prompt":"Show me the last 6 months of US rail carload volumes so I can see whether freight activity has been increasing or declining recently."},{"title":"Intermodal shipment monitoring for logistics team","prompt":"Fetch the past 12 months of US Class I intermodal unit data from FRED — I want to track how container-on-rail volumes have trended this year."},{"title":"Supply chain macro indicator briefing","prompt":"What's the latest US rail carload count from the AAR data, and how does it compare to the previous 3 months? I'm preparing a supply chain market update."}],"resultDescription":"Returns a JSON object with the FRED series ID, measurement type (carloads or intermodal), the latest date-value pair, an array of recent monthly observations (up to 60 months), the FRED source URL, and a timestamp of when the data was last checked.","failureModes":["Invalid 'series' parameter value (not 'carloads' or 'intermodal') returns an error","'months' value outside 1–60 range may return an error or be clamped","FRED upstream unavailability may result in stale or missing data","No corridor-level breakdown is available — only national totals","Data may lag by several days to weeks depending on AAR reporting cadence"],"whenToPreferThis":"Choose this endpoint when you need national-level US Class I railroad freight volumes (carloads or intermodal) with recent monthly history, sourced from FRED's authoritative AAR data series. It is ideal for macro logistics monitoring, supply chain trend analysis, or economic research. Do not use it if you need corridor-specific traffic data, real-time rail status, or non-US rail statistics.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T00:33:58.810Z","isFirstParty":false,"canonicalSlug":"sitecheck-trade-energy-us-rail-freight-traffic-fred-7f6763bc"}