openrails/openrails
Oct 2024 – Sep 2025
12 Months active
Languages Used
C#rstRSTcsreStructuredText
Technical Skills
Bug FixDocumentationRefactoringBug FixingC#C# Development
César Benito Lamata
PROFILE
César Benito Lamata
Cesar Bema developed advanced locomotive simulation features and core physics improvements for the openrails/openrails repository, focusing on braking, traction, and power management systems. He engineered robust C# modules for adhesion, slip control, and dynamic braking, integrating real-time physics modeling and defensive programming to enhance simulation realism and reliability. His work included refactoring axle and brake logic, improving configuration parsing, and implementing automated power supply management, all while maintaining code quality and documentation. By addressing edge cases and ensuring numerical stability, Cesar delivered maintainable, production-ready code that improved operational safety, user feedback, and the fidelity of train simulation scenarios.
Overall Statistics
Feature vs Bugs
62%Features
Repository Contributions
88Total
Bugs
14
Commits
88
Features
23
Lines of code
4,753
Activity Months12
Your Network
16 people
Work History
September 2025
3 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for openrails/openrails focusing on delivering business value through improved braking realism, parsing robustness, and automated power management. Highlights include critical fixes to braking force distribution, safe and consistent INI loading, and a refactor that enables QuickPowerOn with conditional ETS activation, driving reliability, safety, and efficiency.
3 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for openrails/openrails focusing on delivering business value through improved braking realism, parsing robustness, and automated power management. Highlights include critical fixes to braking force distribution, safe and consistent INI loading, and a refactor that enables QuickPowerOn with conditional ETS activation, driving reliability, safety, and efficiency.
September 2025
August 2025
3 Commits • 1 Features
Aug 1, 2025OpenRails project (openrails/openrails) — August 2025 monthly recap. Focused on robustness of axle simulations and correct initialization for steam locomotive axles to improve reliability and early-stage behavior in simulations. Key changes: - Axle NaN handling robustness: prevent NaN propagation in axle speed and critical speed variables by defaulting NaN axle speed to 0; added TODOs to flag NaN occurrences for investigation. This reduces runtime errors and increases simulation stability. - Initialize adhesion coefficients for steam locomotive axles: ensure adhesion limit and Curtius-Kniffler zero-speed are set at startup when not already configured, guaranteeing locomotives start with appropriate friction coefficients and avoiding issues during initial movement (targeting steam locomotives that are not geared). These changes enhance model fidelity, reduce startup glitches, and improve observability for future diagnostics. Commits underpinning these changes include ee4532413965af10d45e78a88b29f3cc9fe141ba; 87cdd9fa988104343a0e68c211bab421a4d9a4a1; and ccc5c4ddd76c1279b9b3d50bcd3c90502375c370.
August 2025
3 Commits • 1 Features
Aug 1, 2025OpenRails project (openrails/openrails) — August 2025 monthly recap. Focused on robustness of axle simulations and correct initialization for steam locomotive axles to improve reliability and early-stage behavior in simulations. Key changes: - Axle NaN handling robustness: prevent NaN propagation in axle speed and critical speed variables by defaulting NaN axle speed to 0; added TODOs to flag NaN occurrences for investigation. This reduces runtime errors and increases simulation stability. - Initialize adhesion coefficients for steam locomotive axles: ensure adhesion limit and Curtius-Kniffler zero-speed are set at startup when not already configured, guaranteeing locomotives start with appropriate friction coefficients and avoiding issues during initial movement (targeting steam locomotives that are not geared). These changes enhance model fidelity, reduce startup glitches, and improve observability for future diagnostics. Commits underpinning these changes include ee4532413965af10d45e78a88b29f3cc9fe141ba; 87cdd9fa988104343a0e68c211bab421a4d9a4a1; and ccc5c4ddd76c1279b9b3d50bcd3c90502375c370.
July 2025
11 Commits • 2 Features
Jul 1, 2025July 2025 Monthly Summary — OpenRails OpenRails: Key features delivered: - Traction and Slip Control System Overhaul: Reworked traction, slip control, and drive force modeling to deliver more realistic wheel slip handling and power transmission. Notable internal changes include parsing AntiSlip tokens, improved handling to avoid oscillations from SlipPercent, ramp-up aware adjustments for full slip control, ensuring drive force respects the axle and incorporating axle friction into total friction. - Startup Braking Safety and Adhesion/Speed Robustness: Enhanced startup braking safety and optimized adhesion/speed calculations for robust operation. Highlights include applying brakes at startup with minimal reduction, computing wheel speed in simple adhesion models, and hiding NaNs to prevent spurious values from impacting control logic. - Power Supply Reliability and Lead Locomotive Handling: Improved robustness of power supply events and gracefully handling cases with no designated lead locomotive, reducing edge-case failures in power-event processing. Major bugs fixed: - Robust handling of edge-cases in locomotive leadership and power events: Null active locomotive scenarios and absence of a lead locomotive no longer cause failures, improving reliability in production runs. Overall impact and accomplishments: - Increased simulation realism and operational safety through a comprehensive overhaul of traction, slip control, and drive force modeling, complemented by safer startup br braking and robust adhesion/speed calculations. The changes reduce wheel-slip oscillations, improve power transmission fidelity, and mitigate edge-case failures in power-event handling, delivering a more reliable and believable rail physics simulation for training and decision-support. Technologies/skills demonstrated: - Control systems modeling and dynamics (traction, slip, drive force, adhesion) - Defensive programming for null and edge-case scenarios - Friction modeling integration and power-event robustness - Code hygiene improvements evidenced by NaN handling and clearer commit intent
11 Commits • 2 Features
Jul 1, 2025July 2025 Monthly Summary — OpenRails OpenRails: Key features delivered: - Traction and Slip Control System Overhaul: Reworked traction, slip control, and drive force modeling to deliver more realistic wheel slip handling and power transmission. Notable internal changes include parsing AntiSlip tokens, improved handling to avoid oscillations from SlipPercent, ramp-up aware adjustments for full slip control, ensuring drive force respects the axle and incorporating axle friction into total friction. - Startup Braking Safety and Adhesion/Speed Robustness: Enhanced startup braking safety and optimized adhesion/speed calculations for robust operation. Highlights include applying brakes at startup with minimal reduction, computing wheel speed in simple adhesion models, and hiding NaNs to prevent spurious values from impacting control logic. - Power Supply Reliability and Lead Locomotive Handling: Improved robustness of power supply events and gracefully handling cases with no designated lead locomotive, reducing edge-case failures in power-event processing. Major bugs fixed: - Robust handling of edge-cases in locomotive leadership and power events: Null active locomotive scenarios and absence of a lead locomotive no longer cause failures, improving reliability in production runs. Overall impact and accomplishments: - Increased simulation realism and operational safety through a comprehensive overhaul of traction, slip control, and drive force modeling, complemented by safer startup br braking and robust adhesion/speed calculations. The changes reduce wheel-slip oscillations, improve power transmission fidelity, and mitigate edge-case failures in power-event handling, delivering a more reliable and believable rail physics simulation for training and decision-support. Technologies/skills demonstrated: - Control systems modeling and dynamics (traction, slip, drive force, adhesion) - Defensive programming for null and edge-case scenarios - Friction modeling integration and power-event robustness - Code hygiene improvements evidenced by NaN handling and clearer commit intent
July 2025
June 2025
8 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for openrails/openrails: Focused on realism, stability, and control of adhesion and traction in rail simulations. Key features delivered include adhesion and traction realism improvements, with corrected axle-speed handling, refined traction force calculations near maximum speed, a baseline adhesion multiplier for non-advanced scenarios, and wheelslip prevention for steam locomotives under simple adhesion. In addition, the slip control and traction systems were overhauled to migrate anti-slip logic to tractive-force calculations, reimplement legacy slip control with refined parsing/initialization, and extend braking and traction application through DynamicBrake, including coverage for dynamic braking scenarios. Major bugs fixed during the period include correcting the order of conditional checks in the adhesion logic, increasing the adhesion multiplier for simple adhesion, and ensuring steam locomotives do not wheel-slip under simple adhesion. The overall impact is a more realistic, stable, and controllable simulation with improved testing fidelity, enabling safer testing and more accurate demos. Technologies demonstrated include real-time physics modeling, tractive-force based slip control, DynamicBrake integration, parsing/initialization refinements, and robust braking-traction interaction. Business value includes improved model fidelity, reliability, and developer velocity for simulations and demos.
June 2025
8 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for openrails/openrails: Focused on realism, stability, and control of adhesion and traction in rail simulations. Key features delivered include adhesion and traction realism improvements, with corrected axle-speed handling, refined traction force calculations near maximum speed, a baseline adhesion multiplier for non-advanced scenarios, and wheelslip prevention for steam locomotives under simple adhesion. In addition, the slip control and traction systems were overhauled to migrate anti-slip logic to tractive-force calculations, reimplement legacy slip control with refined parsing/initialization, and extend braking and traction application through DynamicBrake, including coverage for dynamic braking scenarios. Major bugs fixed during the period include correcting the order of conditional checks in the adhesion logic, increasing the adhesion multiplier for simple adhesion, and ensuring steam locomotives do not wheel-slip under simple adhesion. The overall impact is a more realistic, stable, and controllable simulation with improved testing fidelity, enabling safer testing and more accurate demos. Technologies demonstrated include real-time physics modeling, tractive-force based slip control, DynamicBrake integration, parsing/initialization refinements, and robust braking-traction interaction. Business value includes improved model fidelity, reliability, and developer velocity for simulations and demos.
May 2025
17 Commits • 3 Features
May 1, 2025May 2025 monthly summary for openrails/openrails focused on delivering core traction, braking, and axle dynamics enhancements, improving realism, stability, and maintainability. Emphasis on business value through safer braking behaviors, clearer user feedback, and a robust foundation for future testing and feature work.
17 Commits • 3 Features
May 1, 2025May 2025 monthly summary for openrails/openrails focused on delivering core traction, braking, and axle dynamics enhancements, improving realism, stability, and maintainability. Emphasis on business value through safer braking behaviors, clearer user feedback, and a robust foundation for future testing and feature work.
May 2025
April 2025
12 Commits • 1 Features
Apr 1, 2025April 2025 — OpenRails repository openrails/openrails saw substantial propulsion and braking improvements. Delivered power ramping and traction modeling enhancements to provide more realistic locomotive power application and traction limits, and implemented braking correctness fixes to ensure reliable interaction between dynamic braking, throttle, and the SME braking system. The work increased fidelity, safety, and maintainability, enabling more accurate simulations and faster QA.
April 2025
12 Commits • 1 Features
Apr 1, 2025April 2025 — OpenRails repository openrails/openrails saw substantial propulsion and braking improvements. Delivered power ramping and traction modeling enhancements to provide more realistic locomotive power application and traction limits, and implemented braking correctness fixes to ensure reliable interaction between dynamic braking, throttle, and the SME braking system. The work increased fidelity, safety, and maintainability, enabling more accurate simulations and faster QA.
March 2025
6 Commits • 3 Features
Mar 1, 2025March 2025 performance highlights for openrails/openrails: delivered reliability and realism improvements across power, braking, and audio subsystems. Key features delivered include a targeted refactor and defaults for steam locomotive power initialization, improved event-driven sound handling, and updated documentation to prevent user confusion. Major bug fixes hardened simulation stability and safety in braking and gear systems. Overall, these changes reduce startup failures, prevent braking crashes, and enhance user-facing realism and maintainability.
6 Commits • 3 Features
Mar 1, 2025March 2025 performance highlights for openrails/openrails: delivered reliability and realism improvements across power, braking, and audio subsystems. Key features delivered include a targeted refactor and defaults for steam locomotive power initialization, improved event-driven sound handling, and updated documentation to prevent user confusion. Major bug fixes hardened simulation stability and safety in braking and gear systems. Overall, these changes reduce startup failures, prevent braking crashes, and enhance user-facing realism and maintainability.
March 2025
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for openrails/openrails: Key feature and safety fixes delivered with a focus on diagnostic clarity and braking safety. Implemented enhanced error logging for signal textures in the 3D viewer to accelerate debugging (commit 7efd35535a23c4dda622121c5f74cbf240a205c3). Fixed a safety-critical issue by ensuring EP brakes cannot release while the holding wire is active, preventing unintended braking (commit 14c132b3244f1668072257cd8ff996e847d0313f). These changes improve reliability, reduce mean-time-to-resolution for texture issues, and strengthen control safety in braking systems. Technologies demonstrated: error handling, logging instrumentation, safety-critical control logic, and traceable commits.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for openrails/openrails: Key feature and safety fixes delivered with a focus on diagnostic clarity and braking safety. Implemented enhanced error logging for signal textures in the 3D viewer to accelerate debugging (commit 7efd35535a23c4dda622121c5f74cbf240a205c3). Fixed a safety-critical issue by ensuring EP brakes cannot release while the holding wire is active, preventing unintended braking (commit 14c132b3244f1668072257cd8ff996e847d0313f). These changes improve reliability, reduce mean-time-to-resolution for texture issues, and strengthen control safety in braking systems. Technologies demonstrated: error handling, logging instrumentation, safety-critical control logic, and traceable commits.
January 2025
8 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for openrails/openrails focused on braking realism, signaling customization, battery modeling, and code robustness. Delivered new braking controls, enhanced display and cabview docs, and improved battery parameters, while also fixing stability issues in the brake system and updating runtime documentation to support ongoing maintenance and onboarding.
8 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for openrails/openrails focused on braking realism, signaling customization, battery modeling, and code robustness. Delivered new braking controls, enhanced display and cabview docs, and improved battery parameters, while also fixing stability issues in the brake system and updating runtime documentation to support ongoing maintenance and onboarding.
January 2025
December 2024
7 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for openrails/openrails showing focused delivery on brake system enhancements, robustness, and documentation improvements to improve realism and reliability of brake simulations across train configurations.
December 2024
7 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for openrails/openrails showing focused delivery on brake system enhancements, robustness, and documentation improvements to improve realism and reliability of brake simulations across train configurations.
November 2024
9 Commits • 3 Features
Nov 1, 2024November 2024 focused on delivering end-to-end locomotive control enhancements and robustness improvements to increase operational reliability and efficiency across openrails/openrails. Key work spanned power management integration, realism in traction and braking, enhanced status visibility, and robustness fixes for selector handling. The changes optimize AI and manual operations, improve safety and energy efficiency, and reduce runtime crashes through more robust save/restore paths.
9 Commits • 3 Features
Nov 1, 2024November 2024 focused on delivering end-to-end locomotive control enhancements and robustness improvements to increase operational reliability and efficiency across openrails/openrails. Key work spanned power management integration, realism in traction and braking, enhanced status visibility, and robustness fixes for selector handling. The changes optimize AI and manual operations, improve safety and energy efficiency, and reduce runtime crashes through more robust save/restore paths.
November 2024
October 2024
2 Commits • 1 Features
Oct 1, 2024Month 2024-10 — Key features and bug work delivered for openrails/openrails: fix for service retention cancellation across diesel and electric locomotives, and documentation updates for battery voltage monitoring and charge-voltage curve. These changes improve reliability, realism, and guidance for users while enhancing maintainability.
October 2024
2 Commits • 1 Features
Oct 1, 2024Month 2024-10 — Key features and bug work delivered for openrails/openrails: fix for service retention cancellation across diesel and electric locomotives, and documentation updates for battery voltage monitoring and charge-voltage curve. These changes improve reliability, realism, and guidance for users while enhancing maintainability.
Activity
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Quality Metrics
Correctness86.0%
Maintainability85.0%
Architecture80.8%
Performance78.2%
AI Usage20.4%
Skills & Technologies
Programming Languages
C#RSTcsreStructuredTextrst
Technical Skills
3D RenderingAsset ManagementBackend DevelopmentBitwise operationsBrake SystemsBraking SystemsBraking Systems SimulationBug FixBug FixingC#C# DevelopmentCode DocumentationCode OrganizationCode QualityCode Refactoring
Repositories Contributed To
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