Powering Trams Without Overhead Wires: Static Charging

Why It Matters

Static charging preserves historic cityscapes while meeting modern performance demands, giving transit agencies a low‑visual‑impact electrification option. Its proven reliability accelerates adoption of sustainable tram networks worldwide.

Key Takeaways

• Mersen's static collector now handles up to 1,600 A
• Charging occurs in ~20 seconds while tram doors open
• Ground‑based rail energised only when tram correctly positioned
• COMSOL multiphysics modelling ensured thermal and electrical reliability
• Deployments span Europe, Australia, and Saudi Arabia projects

Pulse Analysis

Urban tram operators are increasingly forced to balance electrification with visual heritage preservation. Traditional overhead catenary systems, while technically mature, clash with the aesthetic goals of historic districts and UNESCO sites. Ground‑based static charging offers a discreet alternative, delivering high‑power energy transfer from an embedded rail only when a tram is stationary at a station. This approach reduces visual clutter, cuts long‑term infrastructure costs, and aligns with city planners’ push for cleaner streetscapes, positioning static charging as a strategic asset in modern urban mobility.

The engineering hurdles of static charging are substantial. Mersen’s latest collector must move 1,600 A within a 20‑second window, demanding precise control of contact resistance, heat dissipation, and mechanical stability. By employing COMSOL Multiphysics, the team simulated coupled electrical‑thermal behavior, optimizing material selection and geometry to keep temperatures within safe limits. Rigorous bench tests at the Saint Bonnet de Mure facility validated these models, while field trials revealed the impact of passenger‑induced micro‑movements on contact pressure. Continuous refinement based on real‑world data has forged a robust design that tolerates the dynamic stresses of daily service.

Commercially, the technology is gaining traction across continents. Deployments in Luxembourg, France, Spain, Sydney’s Parramatta line, and the AlUla tourism corridor in Saudi Arabia demonstrate versatility in varied regulatory and climatic contexts. For manufacturers and transit agencies, static charging reduces capital outlay for overhead infrastructure and simplifies maintenance, while offering a future‑proof platform that can evolve alongside advancing battery and super‑capacitor technologies. As cities prioritize both sustainability and heritage protection, static tram charging is poised to become a cornerstone of next‑generation public transport networks.