In-Building Solutions for Underground Rail

Turnkey Prime Contractor

Neutral Host Architecture

As prime contractor to major UK operators, we originate and own the engineering plan to deploy continuous high-capacity connectivity across unserved London subterranean transit routes.

Our multi-operator infrastructure framework ensures simultaneous 4G and 5G network coverage for all major UK mobile operators without duplicating subterranean equipment footprints.

Active and Passive DAS Deployment

Optical Master Units

Remote Radio Heads

Radiating Cable Networks

Centralized master units installed in secure surface headends process RF signals from all major carrier base stations for distribution into deep underground rail lines.

Compact, ruggedized remote radio units strategically positioned within subterranean station concourses and platform caverns deliver ultra-low latency mobile coverage.

Leaky feeder radiating coaxial cables mounted continuously along tunnel archways maintain uninterrupted RF propagation for high-speed trains travelling through deep-level tubes.

Sub-Surface Fiber Optical Infrastructure

Ultra-dense single-mode optical fiber backbones engineered specifically for zero-halogen underground environments, ensuring massive throughput between tunnel nodes and surface switching facilities.

Multi-Band Combiners

Spectrum Optimization

Future-Proof 5G NR

Precision low-PIM point-of-interface combiners aggregate 700MHz to 3500MHz spectrums, allowing all mobile networks to share single antenna arrays seamlessly.

Advanced radio frequency management prevents inter-carrier interference in restricted underground spaces, maximizing cell throughput and call handover quality.

Architected from inception for 5G standalone architecture, offering immediate capability for low-latency passenger data services and internet of things sensor grids.

High-Density Station Passenger Wi-Fi

Enterprise-grade Wi-Fi 6 access points deployed across ticket halls, platforms, and escalator shafts, delivering seamless public internet roaming for thousands of concurrent devices.

Electrical Infrastructure & Battery Backup

Dual AC Power Feeds

Industrial Battery Storage

Low-Smoke Cabling

Redundant three-phase power supplies sourced from independent grid substations ensure total operational continuity for critical telecommunication nodes.

Rack-mounted lithium-iron-phosphate battery banks provide up to eight hours of full active load autonomy during primary grid interruptions.

Zero-halogen fire-resistant power cabling certified to rigorous Underground railway standards prevents toxic emissions in subterranean environments.

Vibration Isolation

Closed-Loop Cooling

Engineered stainless steel equipment racks equipped with heavy-duty dampeners withstand continuous track vibration and acoustic shock waves.

Integrated heat exchanger cabinets maintain optimal interior temperature without ingesting brake dust, ambient moisture, or metallic air particles.

Emergency Services Network (ESN) Integration

Airwave & ESN Priority

Fire Survivability

Real-Time Telemetry

Dedicated subterranean channel allocation guaranteed for emergency first responders, maintaining operational radio contact throughout tunnel networks.

Structural cable runs rated to withstand 120 minutes of direct fire exposure, preserving critical alarm telemetry and voice channels.

Automated remote monitoring systems continuously assess system health, signal integrity, and environmental status from surface control centers.

Initiate London Metro IBS Partnership

As originators of this London Underground coverage proposal, British International delivers end-to-end design, civil engineering, fiber installation, and carrier integration.