[#2, #6] One-time structural capital and workshop space: includes reserved fund for major viaduct/earthworks repairs (£500k–£2M range; midpoint used) and upfit/outfitting of a secure climate-controlled workshop (portion of #6).

[#24] Containment capital escalation buffer for unforeseen anomalous scaling, classified relocation or international specialist response (one-time contingency).

[#3, #6, #5, #4, #9, #8, #15, #16, #19, #21, #22] One-time equipment and capital: rolling stock restoration, tooling and machine tools (portion of #6), custom part fabrication (#5), periodic major boiler overhaul (#4), surveillance systems (#9), CCTV/access hardware (#8), emergency response equipment (#15), heavy-transport/relocation mobilization fee (#16), museum/display buildout (#19), environmental upgrade works (#21), and decommissioning/mothball preparation (#22).

[#18] Reserved capital to cover potential incident liabilities and compensation claims (one-time reserved fund).

[#14] Initial research and anomalous-property investigation startup costs, instrumentation and documentation archive buildout (one-time research spend).

[#13] One-off legal work, permits and special regulatory actions required for containment adjustments or exceptional transport.

[#7] Salaries for dedicated professional staff (engine drivers, firemen, maintainers, workshop technicians) to guarantee credentials and continuous availability; 5–10 FTE range used (midpoint).

[#1, #4, #11] Ongoing track, viaduct and drainage maintenance (tamping, ballast, sleeper/rail replacement) plus annual boiler inspections and utilities/operating costs for preservation buildings.

[#8] Ongoing monitoring, guard patrol contract or contracted security services to control access and deter unauthorized boarding.

[#13, #17] Recurring permits, regulatory compliance costs and public cover / PR and FOI response budget.

[#15] Recurring training, standby salaries, vehicle and equipment maintenance for rapid-reaction containment capability.

[#12] Annual insurance premiums for heritage asset and public liability; anomalous risk premium uplift included in midpoint.

[#5, #10] Consumable spare parts inventory and routine shop labor (#5) plus fuel, water and operational consumables (#10).

[#14] Ongoing anomalous-property monitoring, instrumentation upkeep, archival upkeep and low-level research into persistence/neutralization.

[#20] Coordination, training, travel reimbursement and insurance for volunteer support programs that reduce payroll burden.

[#9] Data/maintenance, networking and redundancy costs for sensors and anomaly-monitoring equipment.

[#19] Annual upkeep of archival storage, climate control for exhibits and display maintenance.

[#23] High-quality logs, audits, and recordkeeping systems required for insurance and forensic reconstruction.

[#22] Ongoing storage upkeep and periodic conservation costs in a long-term mothballing scenario.

[#21] Routine emissions monitoring, ash/waste disposal compliance, and small-scale environmental testing.