Effects of European Rail Traffic Management System Onboard Version on Running Time, Driver Target Braking, and Driver Workload
DOI: 10.1177/03611981241311558
archive: archived pipeline: cataloged
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Summary
This study investigates the operational and human factors consequences of upgrading the European Rail Traffic Management System (ERTMS) onboard software from version 3.4 to 3.6, specifically within the context of Baseline 3. The transition involves significant changes to the driver–machine interface (DMI), including the removal of the pre-indication monitoring (PIM) state, a simplified color strategy for speed monitoring, and earlier provision of speed target information. These modifications were designed to refine driver support, yet their impact on capacity-related metrics such as running time and braking behavior, as well as driver workload, remained uncertain. The research aimed to quantify these effects to inform capacity assessments and system design, addressing a gap in understanding how DMI evolution influences driver performance in Level 2 ERTMS operations. The experiment utilized a high-fidelity train driver simulator modeled after a Bombardier Regina electric multiple unit. Thirty-nine student train drivers, recruited from Swedish training academies, completed a 16-km segment of the Ådal line, a route selected for its high demand for driver interaction. Each participant drove the route twice, once with DMI version 3.4 and once with 3.6, in a balanced order. Data collection included extensive vehicle telemetry (speed, position, braking curves) and subjective workload assessments using the NASA Task Load Index (NASA-TLX). The analysis focused on running time over a 14.7-km section, braking duration toward Limit of Authority (LOA) targets, and global workload scores. Results indicated that drivers achieved faster running times with version 3.6, despite experiencing a longer braking phase. The average running time difference was approximately 1% (5.1 seconds), with version 3.6 yielding a mean time of 558.6 seconds compared to 563.7 seconds for version 3.4. This improvement was attributed to drivers accelerating to higher speeds in the earlier part of the profile, facilitated by the clearer speed target information and the absence of the PIM state, which shifted driver attention to the planning area. Regarding braking, version 3.6 resulted in a statistically significant increase in braking time by 0.7 seconds (2.5%) toward LOA targets, as the indication curves were positioned further from the target. Contrary to concerns that increased information might raise cognitive load, driver workload was significantly lower with version 3.6. Specifically, mental demand and effort subscales of the NASA-TLX showed statistically significant reductions, suggesting that the simplified interface and improved information clarity reduced the cognitive burden on drivers. The findings imply that the DMI improvements in ERTMS version 3.6 positively impact operational efficiency by reducing running times without increasing driver workload. The study highlights that while braking phases are slightly longer due to safety margins and curve positioning, the net effect on capacity is beneficial. These results support the adoption of the updated DMI standards, demonstrating that refined signal information and simplified color strategies can enhance both performance and driver comfort, thereby supporting the broader goals of ERTMS interoperability and sustainable railway design.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-08-09 |
| archive | success | openalex | — | — | 5 | 2026-08-09 |
| extract | success | cached | — | — | 5 | 2026-08-23 |
| clean | success | clean | — | — | 2 | 2026-08-10 |
| chunk | success | chunk | — | — | 2 | 2026-08-10 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 2 | 2026-08-10 |
| promote | success | — | — | — | 1 | 2026-08-09 |
| summarize | success | llm | qwen3.8-27b-gittensor | summ-v5 | 3 | 2026-08-23 |
| tag | success | vector_similarity | — | — | 17 | 2026-08-11 |
| verify | success | — | — | — | 2 | 2026-08-09 |
Summary generated by qwen3.8-27b-gittensor on 2026-08-23; verification: pending re-verification.
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- Empirical Findings: behavioral performance data