Common-Rail Injection
Fuel-injection system where pressurised fuel is held in a high-pressure rail and injected per-cylinder via electronically controlled injectors.
In practice
Standard on modern two-stroke and four-stroke marine engines. The chief engineer monitors rail pressure, injector timing, and combustion-chamber temperatures. Failure modes are injector tip erosion (high sulphur fuel) and timing drift (control system).
Regulatory detail & full definition
Common-rail injection is a fuel system in which high-pressure fuel is held in a shared accumulator (the rail) and delivered to each cylinder by electronically controlled injectors, decoupling injection timing and pressure from engine speed. On modern slow-speed marine diesels it replaces the older camshaft-driven jerk-pump system, as in the MAN B&W ME and Wartsila RT-flex engines, allowing precise timing, multiple injection events per stroke and lower NOx and soot, particularly at part load. Rail pressure is typically 1,000-1,500 bar, controlled by the engine's electronic control system (ECS).
Related
Source: Industry usage; MAN B&W ME Engine Technical Description
High confidence
Editorial confidence: how we grade.