What does this research mean for the field?

The external-cost benefits of shifting freight from road to rail in South Korea are approximately 3.7 times higher than currently estimated, indicating that existing policy parameters materially underestimate the social benefits of rail freight. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To recalibrate the external-cost savings of shifting freight transportation from roads to rails across five primary impact domains: air pollution, climate change, noise, accidents, and congestion.

September 8, 2026SystemsOpen Access

Recalibrating the External-Cost Benefits of Road-to-Rail Freight Modal Shift: Evidence from South Korea

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Authors

DKDaejin Kim GOGwanyong Oh HKHyunseung Kim

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Overview

Economic evaluation reveals substantially higher external-cost benefits of rail freight in national transport networks, indicating significant undervaluation in current logistics policies.

Key Points

To recalibrate the external-cost savings of shifting freight transportation from roads to rails across five primary impact domains: air pollution, climate change, noise, accidents, and congestion.
Applied a hybrid framework combining bottom-up emission modeling with top-down allocation of aggregate external costs.
Analyzed link-level national traffic flow records (KOTI View-T 3.0) and national statistics harmonized to a 2022 base year.
Determined a total unit benefit of KRW 151.81 per ton/kilometer for shifting freight to rail, roughly 3.7 times the current inflation-adjusted benchmark.
Demonstrated that updated emission inventories, accident statistics, and unit valuations raise benefits to KRW 69.6 per ton/kilometer, with the remainder driven by revising the link-level road freight traffic share from 3.5% to 21.2%.
Scenario analyses estimated total unit benefits between KRW 38.6 and 217.7 per ton/kilometer, exceeding current valuation benchmarks in all but the single most conservative scenario.

Cite This Study

Kim et al. (2026) studied this question.

synapsesocial.com/papers/6a9fd81458e84d0ff5b474cf https://doi.org/10.3390/systems14091101

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September 8, 2026SystemsOpen Access

Recalibrating the External-Cost Benefits of Road-to-Rail Freight Modal Shift: Evidence from South Korea

View Full Paper

Ask AI

Bookmark

Authors

DKDaejin Kim GOGwanyong Oh HKHyunseung Kim

Discussion

Member takes

Overview

Economic evaluation reveals substantially higher external-cost benefits of rail freight in national transport networks, indicating significant undervaluation in current logistics policies.

Key Points

To recalibrate the external-cost savings of shifting freight transportation from roads to rails across five primary impact domains: air pollution, climate change, noise, accidents, and congestion.
Applied a hybrid framework combining bottom-up emission modeling with top-down allocation of aggregate external costs.
Analyzed link-level national traffic flow records (KOTI View-T 3.0) and national statistics harmonized to a 2022 base year.
Determined a total unit benefit of KRW 151.81 per ton/kilometer for shifting freight to rail, roughly 3.7 times the current inflation-adjusted benchmark.
Demonstrated that updated emission inventories, accident statistics, and unit valuations raise benefits to KRW 69.6 per ton/kilometer, with the remainder driven by revising the link-level road freight traffic share from 3.5% to 21.2%.
Scenario analyses estimated total unit benefits between KRW 38.6 and 217.7 per ton/kilometer, exceeding current valuation benchmarks in all but the single most conservative scenario.

Cite This Study

Kim et al. (2026) studied this question.

synapsesocial.com/papers/6a9fd81458e84d0ff5b474cf https://doi.org/10.3390/systems14091101

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