January 2026 (2026-01) — Frontend and UI-core improvements across OpenRailAssociation/osrd delivering tangible business value and cleaner architecture. Key features delivered: - Translation relocation to map layer and grouping translations for applications' titles to reduce UI fragmentation. - Speed limit tag handling refactor: renamed useStoreDataForSpeedLimitByTagSelector to useSpeedLimitTags and adopted across the codebase. - Distance unit alignment: store pathStep offset in millimeters; ensure all distance calculations use mm to match backend. - RangeEditionLeftPanel simplification: split into Electrification and Speed Edition components. - Map/editor visualization: default map settings updated to always display track sections for better context. Major bugs fixed: - Removed useless call to useStoreDataForSpeedLimitByTagSelector in useStdcm. - Removed defaultSpeedLimitTag from stdcm store and cleaned up related logic. - Stopped handling stdcm speedLimitTags in useSpeedLimitTags; data sourced from DB/store instead. - Track offset calculation fixed to mm to fix distance mapping. - Simulation summary: return undefined while loading to avoid race condition. - Cleaned API surface: removed TrainSchedule endpoints from OpenAPI config. Overall impact and accomplishments: - Improved UI reliability and data integrity; reduced translation and speed-limit drift; enhanced map visualization consistency; and streamlined frontend refactors for easier future work. Technologies/skills demonstrated: - React/TypeScript, UI-core architecture cleansing (Flattened directories, capitalization), hook refactoring and naming consistency, unit handling (mm), performance-oriented cleanups (removal of unnecessary useMemo), and improved test utilities.

Month: 2025-12 — This month the team delivered substantial front-end modernization for OpenRailAssociation/osrd, focusing on API clarity, data-model maturation for paced trains, and UI/UX improvements. We removed legacy surfaces to reduce risk, improved developer productivity, and laid groundwork for paced-trains migration. Key outcomes include consolidated API design, streamlined data structures, and enhanced map/chart interactions that support faster feature delivery and more reliable user experiences.

Month: 2025-11 — OpenRailAssociation/osrd Concise monthly summary focusing on business value and technical accomplishments: Key features delivered - SpaceTimeChart Visual/UI Enhancements: introduced category-based train colors, improved path coloring, and dynamic UI width adjustments (Manchette). This improved readability and situational awareness for operators and analysts. Commits include 450ddbf53479fcad554dce93a49905ea5ec65735; 41ef710b7c39799be0f3e42bdf5b4b309c2774eb; c9d98b6f949f87808816e609cc0601c8cb3d0bc9; 3fd25fd62bae0108f9365c943189525d0eadf7c4. - Macro/Trigram Data Integrity Enhancement: ensured the secondary trigram code is fetched and populated when updating a macro node, strengthening data consistency (commit 98de748f7892052deb56bb171377c55686872680). - Internal SpaceTimeChart Refactors and Architecture Improvements: refactored internals for better maintainability and performance, including moving usePaths into wrappers/helpers, transforming usePaths into a helper, and introducing generalizable contexts (commits 60ef369fa67267dc273a55005b6922efcbbc9135; cc f18e9e7f3a3a24a03247e5b558d79f75781434; 4d9363ff27f3ee2ffc360c0107aeed086d5cf2e1; aa0018993a25903ae451248a7b58d8044e5a2d88; 0b65da9f6186b0ab9c5fc9f9063a5bcd6d52f4fc; e3ac4b25bd9f2dd02a035a4f8ebd5162165c2ce5; 9bf3247d93b48749f9ce232ff0a40fdd712dd4cb; d84582317d7ba9ca9b4224bc8db048008144b821). - Data modeling and type-safety improvements: migrated from dicts to maps for opsByWaypointId, renamed timetableItemsById to timetableItemsProjectionsById, and dropped the redundant OccupancyTrainSpaceTimeData type to simplify the codebase (commits 0b65da9f6186b0ab9c5fc9f9063a5bcd6d52f4fc; e3ac4b25bd9f2dd02a035a4f8ebd5162165c2ce5; d84582317d7ba9ca9b4224bc8db048008144b821). Major bugs fixed - Data integrity gaps addressed by ensuring trigram secondary codes are populated during macro updates, reducing downstream inconsistencies. - Several refactors corrected architectural expectations and improved stability of SpaceTimeChart computations, path calculations, and data posting workflows. Overall impact and accomplishments - Improved user-facing visualization quality and reliability of SpaceTimeChart, enabling faster, more accurate interpretation of train paths and spacetime relationships. - Strengthened data integrity across macro and trigram updates, reducing error propagation. - Significantly improved code quality, maintainability, and future-proofing through architectural refactors, clearer contexts, and safer data structures. - Delivered tangible performance and usability benefits with dynamic UI behavior and safer type usage, enabling more robust development and quicker feature iteration. Technologies/skills demonstrated - Front-end React/TypeScript development, UI charting (SpaceTimeChart), and dynamic styling. - Architectural refactoring, context management, and helper extraction for complex visual components. - Data integrity practices, type-safety improvements, and codebase simplification (maps, renames, type drops).

Month: 2025-10 | Focus: Localization work for OpenRailAssociation/osrd, targeting improved accessibility through Spanish translation of Operational Studies. This work lays the groundwork for broader multilingual support and aligns terminology across translated content. Progress to date: 6 of 522 strings translated (1.1%) via Weblate; adjustments made to terms for consistency and clarity. Commit: b9fb0cf4a49c98a8fc3b524730db4e02cf94a312; Message: front: operational-studies: translated using weblate (Spanish). Signed-off-by: clarani <clara.ni@outlook.fr>

OpenRailAssociation/osrd and osrd-website — September 2025 monthly summary focused on UI modernization, context-driven data flows, and repository restructuring to improve maintainability and scalability. Key frontend deliverables include NavBar refactor with grouped components and corrected ReleaseInformation naming; centralization of RoundTrips and Timetable types under ScenarioView; migration of related folders; and standardized naming across hooks, selectors, and exports. Adopted useScenarioContext in useSimulationResults and aligned context shape by using infra.id; removed deprecated selectors (getOperationalStudiesInfraID); improved data handling (formatRows and PathStep types) and naming (operationalPointsOnPath). UI enhancements include preserving lonely nodes in Macro mode, enabling interactions with the quadrilateral layer in charts, and a waypoint visibility toggle. Project structure refactor and folder/hook renaming consolidated helpers and relocated components, reducing cross-repo dependencies and technical debt. Updated frontend contribution guidelines to enforce precise naming conventions.

Month: 2025-08 — Summary of OpenRailAssociation/git-driven delivery across osrd and osrd-website. Delivered substantial frontend architecture refinements, data-model updates, UI polish, and documentation improvements that collectively improve maintainability, reliability, and business value. The work focused on scalable UI structuring, accurate data projection items, and performance-conscious UI improvements, enabling faster feature delivery with fewer regressions.

July 2025 was focused on stabilizing and accelerating front-end delivery for OpenRailAssociation/osrd through targeted refactors, consistent interfaces, and polished UI. Key features shipped include a SimulationTable refactor with props harmonization to reduce formatting duplication; a PacedTrain and Occurrence Details extraction refactor introducing a unified PacedTrain structure; migration of selection logic to useSelectedTimetableItem with direct usage of occurrence rollingStock in actions; integration of exception simulation retrieval and storage within PacedTrainWithDetails and their UI presentation; and base timetable details formatting improvements with more specific rolling stock data and clearer summaries, complemented by UI polish in the simulation settings and scenario details. Critical UI bugs fixed and technical cleanliness improvements also completed to boost reliability and maintainability.

June 2025: Delivered a focused front-end data-model consolidation and UI improvements for OpenRailAssociation/osrd. Implemented comprehensive front-end refactors, introduced train-oriented endpoints and types, and added reporting/export capabilities, driving data integrity, developer productivity, and improved operator workflows.

May 2025 performance summary for OpenRailAssociation/osrd: Delivered a major front-end consolidation of ID utilities, modernized translation architecture, and UI enhancements, while addressing key bugs to improve reliability, localization, and user workflows. The month focused on reducing technical debt, aligning naming conventions, and enabling more robust localization across modules, resulting in a cleaner, more maintainable codebase and a smoother operator experience.

April 2025 recap: Delivered cohesive frontend enhancements across osrd and the website that improve maintainability, user experience, and test reliability. Major efforts included a module refactor to consolidate TrainSpaceTimeData and useLazyLoadTimetableItems under simulationResults, new pacing-related utilities, a bug fix to preserve the selected train after timetable edits, and broad cleanup of test data and translations to reduce noise and drift. These changes drive faster, more predictable feature delivery and a more scalable frontend foundation.

March 2025 monthly summary for OpenRailAssociation tooling. Focused on frontend UX improvements, data model refinements, and repository-wide maintainability enhancements across osrd and osrd-ui. Key outcomes include centralized environment updates for STDCm, enhanced power restriction interval editing, paced-train editing and timetable management in Operational Studies, Storybook reorganization, type consolidation for SpeedSpaceChart, and dev tooling cleanup. These changes improve data integrity, user experience, deployment clarity, and developer efficiency, enabling faster feature delivery with fewer regressions across deployments.

February 2025 — OSRD portfolio: Delivered API modernization, map infrastructure upgrades, and UI/UX improvements across osrd, osrd-website, and osrd-ui, enabling clearer APIs, scalable rendering, and faster delivery cycles. The month emphasized business value through reliability, maintainability, and improved developer experience, with foundational changes that support future features and faster iteration. Key outcomes include API clarity for point coordinates, performance-oriented reducer refinements, and a robust map infrastructure that supports modular layers and easier extension. In parallel, documentation and packaging improvements prepare teams for efficient testing and consistent UI across dashboards.

January 2025 monthly summary for OpenRailAssociation OSRD and OSRD-UI focusing on delivering user value, stabilizing core workflows, and improving developer productivity. Key frontend features and UX improvements include StopDurationInput rename to stopDurationInput with proper refactor, enabling deletion of project images during editing, and cleanup of PictureUploader props. Additional user-facing enhancements include displaying RS name in StdcmReportSheet, improved tagging for projects/studies/scenari, and stdcm user help visibility. Core infrastructure and pathfinding improvements include refactoring infra object layers into a single component with layerSettings, adding pathfinding utilities getTrackLengthCumulativeSums and getPointOnPathCoordinates, separating lazy train hooks, and consolidating related calculations in the spacetime/manchette display flow. UI dependencies were upgraded (ui-core to 0.0.61) to enable newer components and better stability. StdCM store enhancements add simulations, index retention, selectedSimulation, and cleanup of an obsolete action, enhancing traceability and end-to-end scenario handling.

December 2024 performance highlights for OpenRailAssociation: What was delivered (Key features and refactors): - Pathfinding context and state integration: Added ManageTrainSchedule context and integrated pathfinding state via usePathfinding to the new context, enabling more cohesive train-scheduling workflows across the UI (commits 05ff280f7acbe25301ae34d65acbcb2a7daaf5f0; b737424df2b11d2cd9cf42ea63dec2836e795238). - Pathfinding cleanup and type-safety: Removed the legacy pathfinding reducer and tightened path properties typing to reduce runtime errors and misconfigurations (commits c24a6ceb2b2213019d76dfc5f75ae05eaf1f30df; c1d74ad892c90e8373db2174ce941f798041e897; 1875bc7dbf870c1ee0ee9377c8aa32c826a1f9c2). - Core pathfinding refactor and pathStep handling: Refactored computeBasePathSteps to computeBasePathStep, improved pathStep centering and failure handling, and extracted buildOpSearchQuery from osrdToNge to improve maintainability (commits 5c2c58245090e31d9b4a946aef39cf587eef9ca4; 5a176ecf007f6088f87fe1a6caf9f8ef51a6d28b; e4f331ef3f803dc5716e9bc952015db17546a4bc; f3b1df6e52b35491f8787369c1c311425169573f). - UI/UX and simulation display enhancements: Improved visibility of simulation inputs, adjusted tolerances with safer defaults, and ensured arrival times are correctly placed; removed unnecessary origin/destination checks and refined readiness-based rendering to improve user experience in simulation and planning workflows (commits 50d4b7300021bb80716881653bd9661dad236135; 01fef3c4dd3f1a9a196b68a937c4c03b49793f47; 0f5f813579aeb15604f2ccdbcd16710b9f51fb97; 9140024eb2935b9aa99f312f483b6899b8f4c139; 07e13ab2b92233c64014ba12fc7303ddb2323c09; 5338a5a1b23063f88bb2ed3695e59e4094570bd6). - ImportTrainSchedules robustness and error handling: Expanded import to support any file type, added validation, and improved error messaging for failed imports to reduce support overhead and improve user guidance (commits 6579b0d260573580d5bbb6ef686b128938996ebb; 374043d337e473702a03d57b3b95873f13f877da; 04792ffd603dfc51784f3eec33776ea2d369b488; b4cf8b1eee502268f7e8cb50ec33272633b6e1b3; 0200258633345baf761ce31219d74dfe5967b230). - Configuration/state refactor and scheduling utilities: Consolidated configuration state under OperationalStudiesConf naming and moved related selectors, plus itinerary and op-schedule improvements that streamline workflows and reduce coupling (commits 980149c1fcf87e79cd22f549656dbb8f84b9cfcd; 9c5ee0d4c91c568c546fc1391f53eb281dc082e6; 177e8e8244cf21701591b7192d3b941d4e008d8f; de25aca7926e0e3cff4c5664c85e9ee5963a0564; 477b988345f5e1aed800da7f7dcdc3f73f5e0ebd; ec0c1a4ba22a21da850236d37c166dd9d40a28a1). - osrd-ui enhancements: Improved component ergonomics with generic type support and outside-click handling for more robust interaction patterns (commit 3e679f795e5bae2e18627c088f33af51a65c3803).

November 2024 — OpenRailAssociation/osrd: Delivered substantial frontend improvements, stronger type safety, and higher test coverage, driving reliability and business value. Key outcomes: - Added end-to-end tests for maintainers to boost automation coverage and reduce maintenance risk (commit: 00f5977e70a4a7d0a7bcaf6d2f6ebad7e24f9620). - Refactored data flow and typing to simplify frontend code and reduce runtime errors (useOutputData refactor; MarkerInformation type; separation of StdcmPathStep and PathStep types; SimulationResults consolidation). - Pathfinding and UI workflow improvements: refactored pathfinding query construction and related actions, integrating postInfra path queries into the frontend query layer and streamlining usage. - UI polish and consistency: rem-to-px migrations across common, stdcm, operationalStudies, and editor; frontend CSS cleanup and styling improvements; display of electrical profile set name in scenario for better context (Scenario UI Improvements). - Dependency upgrades: osrd-ui bumped to v53 with speed-space-chart, ui-core, and ui-icons updates to align with latest features and performance. Major bugs fixed: - Fix type in getTimesInfoFromDate to prevent runtime errors. - Fix train edition setup to ensure proper initialization. - Fix stdcm passages rendering/logic. Overall impact and accomplishments: - Higher reliability and maintainability through automated test coverage, safer tech debt refactors, and consistent UI/UX across modules. - Clearer data models and stronger type safety reduced risk of regressions in frontend features. - Faster delivery of UI changes and smoother pathfinding workflow, enabling quicker validation and iteration for product features. Technologies/skills demonstrated: - TypeScript typing improvements and type-safe refactors. - Frontend architecture: reducer organization and modularization of actions. - Test automation: end-to-end tests and improved CI reliability. - UI/UX improvements: rem-to-px migrations, CSS cleanup, and scenario context enhancements. - Dependency management: updating core UI libraries to recent versions.

October 2024 performance summary for OpenRailAssociation (osrd-ui and osrd). Key features and improvements delivered include a UI terminology refresh, centralized pathfinding data handling, debug-mode UI enhancements, projections loading state, and a library upgrade for better component compatibility. These changes deliver clearer UX, more reliable path calculations, faster debugging, smoother projection interactions, and a cleaner upgrade path. Impact and value: - Clarity: consistent terminology (waypoints) across frontend components. - reliability: standardized step location data improves pathfinding accuracy for multiple step types. - observability: debug-mode data improves developer diagnostics. - UX: loading indicators reduce perceived latency during projections. - maintainability: OSRD-UI upgrade aligns props and types for future enhancements.