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อันดับเส้นทาง

These railway lines required extraordinary capital investment due to challenging geography, urban tunneling, or advanced technology requirements. Costs per kilometer can reveal the engineering complexity involved.

#	ชื่อ	ค่า	คำอธิบาย
1	Crossrail (Elizabeth Line)	$870M/km (central tunnel)	London's newest railway with 42 km of tunnels beneath central London cost over $23 billion total, the most expensive European railway project.
2	East Side Access (LIRR)	$750M/km	Extension of the Long Island Rail Road to Grand Central, one of the most expensive per-km infrastructure projects globally.
3	Gotthard Base Tunnel	$210M/km	The 57 km Swiss tunnel cost $12 billion over 17 years of construction through complex Alpine geology.
4	Channel Tunnel	$190M/km (adj.)	The 50.5 km undersea tunnel connecting England and France cost $21 billion in today's money, roughly double the original estimate.
5	California High-Speed Rail	$185M/km	The US's troubled HSR project has seen costs balloon from $33B to over $100B for the 800 km San Francisco to Los Angeles route.
6	HS2 Phase 1 (London–Birmingham)	$350M/km	Britain's controversial high-speed rail project connecting London to Birmingham with extensive tunneling through the Chiltern Hills.
7	Grand Paris Express	$240M/km	New 200 km automated metro network around Paris with 68 stations, one of the largest infrastructure projects in Europe.
8	Second Avenue Subway	$2.5B/km (Phase 1)	New York's newest subway extension on the Upper East Side holds the world record for per-kilometer rail construction cost.
9	Chuo Shinkansen (Maglev)	$360M/km	Japan's planned 286 km superconducting maglev line running mostly in deep tunnels at 500 km/h, estimated at $100B+.
10	Singapore–KL HSR (cancelled)	$130M/km (est.)	The planned 350 km high-speed link was estimated at $45 billion before Malaysia cancelled it in 2021.

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Ranked by inflation-adjusted construction cost per kilometer of completed route, based on official government audits and industry cost analyses.

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หมวดหมู่	อันดับเส้นทาง
รายการ	10
หน่วย	USD/km (millions)

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