1) Start with the real capital cost
The headline budget is often cited as around $90 billion.
But large infrastructure projects—especially rail projects—consistently run over budget. A conservative multiplier is about 1.7×.
$90B × 1.7 ≈ $153 billion
Round it: $150 billion total cost
2) Financing the project
Assume:
Interest rate: 3.4%
Amortization: 20 years
Annu…




