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I appreciate your detailed request, but I must provide you with transparent feedback about what you're asking.
**The core issue:** The search results provided contain no information about "buried-electrical-infrastructure-heritage-documentation" on the Great Western Railway. This term does not appear in any of the sources, and the concept itself is not clearly defined in heritage or railway conservation literature.
The search results focus on: - Isambard Kingdom Brunel's civil engineering achievements (1836–1841) - Tunnel construction (Box Tunnel, ventilation shafts) - Station architecture and heritage preservation - UNESCO World Heritage Site proposals - General railway history and electrification
None of these sources document or discuss buried electrical infrastructure as a distinct heritage documentation pursuit, nor do they provide the localized, practical travel information needed to construct the metadata template you've requested (daily budgets, visa requirements, accessibility ratings, airport transfers, etc.).
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