Electric Subway Systems
Electrified underground rapid transit combining tunnels, signaling, stations, and traction power.
Core metadata
- ID: urban_electric_subways
- Era: Industrial
- First known date: 1891 (decade)
- Region: Europe and United States
- Review status: source_checked
- Maturity: N/A
Prerequisites
Dependents
- None.
Fields
Field lanes
- Civil Engineering & Built Environment: Transport Infrastructure
Node sources
- Subway (Encyclopaedia Britannica, 2026, textbook) • Supports: edge, node
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 2
- Average edge confidence: 68%
- Prerequisite sources: 2
- expert_inference: 2
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Electric Tramways (electric_tramways) | enabling | 68% | expert_inference | Electric Tramways provides a capability that enables this technology without being the only possible path. |
|
| Electrical Substations (electrical_substations) | enabling | 68% | expert_inference | Electrical Substations provides a capability that enables this technology without being the only possible path. |
|
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