中美基建类比：高铁、大桥、调水三组同类项目，花销、工期、质量对照
同类工程，放在一起比，才看得出花销、工期与质量的差距。本篇选三组可比项目：高铁以加州高铁对京沪高铁，大桥以旧金山海湾大桥东段对港珠澳大桥，调水以加州塞兹水库与三角洲隧道对南水北调。需要先说明：币种、统计口径与建设条件不同，数字只能作类比参照，不能直接等同。
一、高铁：加州高铁对京沪高铁
加州高铁一期约795公里，最新估算约1262亿美元，折合约每公里1.59亿美元。京沪高铁全长1318公里，造价2209.4亿元人民币，折合每公里约1.68亿元人民币，两者每公里造价相差约7倍（按名义汇率折算）。工期上，京沪高铁2008年4月18日开工、2011年6月30日通车，设计时速350公里，最快运行时间4小时18分；加州高铁2015年动工，11年后仍无任何客运段通车，默塞德至贝克斯菲尔德段目标2033年、一期目标2040年。中国高铁网到2025年底超过5万公里，2024年客运量32.72亿人次。美国最快的Acela列车最高时速150英里、新一代列车160英里，华盛顿至纽约平均时速约81.7英里。
二、大桥：海湾大桥东段对港珠澳大桥
海湾大桥东段重建于2002年1月29日动工、2013年9月2日通车，历时约11年7个月，造价65亿美元，按2024年美元计约86.1亿美元。当年讨论时出现的2.5亿美元，只是抗震加固选项的报价，不是重建报价。港珠澳大桥全长55公里、主体工程29.6公里，总投资超过1200亿元人民币（主体约480亿元），2009年12月15日动工、2018年10月24日通车。折算每公里造价，海湾大桥东段约18.6亿美元，港珠澳大桥主体约21.8亿元人民币（约3亿美元）。两座桥的地质、功能与跨度条件差异很大，单位造价同样只能参照，不能直接判定优劣。
三、调水：塞兹与三角洲隧道对南水北调
南水北调中线工程2003年12月27日开工、2014年12月12日通水，历时约11年；东线与中线合计官方投资约620亿美元量级（含文献估算约794亿美元），丹江口水库移民约33万至37.5万人。对照之下，塞兹水库自1950年代提出至今未建：2014年1号提案为储水项目安排27亿美元，塞兹造价已从2021年的39亿美元升至2025年的62亿至68亿美元，州政府承诺约13.63亿美元，最终取水许可2026年11月4日审议，计划2027年动工、2034年供水。三角洲隧道长约45英里，水资源厅估算约201亿美元、反对者估算600亿至1000亿美元以上，其融资方案已被法院驳回，没有机构承诺承建，至今未动工。
四、质量：两边都有纪录，也都有教训
港珠澳大桥设计寿命120年；海湾大桥拥有全球最宽桥面，日车流量约27万辆。京沪高铁自2015年起盈利，2017年营收295.95亿元、利润127.16亿元。另一方面，2011年7月23日温州动车事故造成40人死亡、170多人受伤，54名责任人被处分，是中国高铁史上最沉重的安全教训。美国土木工程师学会2025年成绩单给美国基础设施整体评C级：桥梁C级（44.1%状况良好、49.1%一般、6.8%较差），道路D+级，铁路B-级；桥梁与道路的资金缺口分别约3730亿与6840亿美元，两党基础设施法五年投入约3510亿美元。
小结
三组类比放在一起看：高铁比的是建成速度与单位造价，大桥比的是复杂工程的总成本控制，调水比的是从立项到动工的决策周期。口径不同、条件不同，任何单一数字都不足以给一个国家的基建能力下结论，但把同类项目逐项摆在一起，差距出在哪里，一目了然。
关联：加州「烂尾账本」走红华人社群：高铁、911、无家可归者拨款，逐项对照官方记录
US vs China Infrastructure, Side by Side: High-Speed Rail, Bridges, and Water Diversion Compared on Cost, Schedule, and Quality
Comparable projects, placed side by side, show what differs in cost, schedule and quality. This article pairs three sets: California High-Speed Rail against the Beijing-Shanghai high-speed railway; the San Francisco-Oakland Bay Bridge eastern span against the Hong Kong-Zhuhai-Macau Bridge; and California's Sites Reservoir and Delta tunnel against China's South-North Water Transfer. Currencies, accounting conventions and construction conditions differ, so the figures are analogies, not equivalences.
1. High-speed rail. California's Phase 1 runs about 795 km at an estimated $126.2 billion, roughly $159 million per km. The Beijing-Shanghai line is 1,318 km and cost 220.94 billion yuan, about 168 million yuan per km — a per-kilometer gap of roughly seven times at nominal exchange rates. Beijing-Shanghai broke ground on April 18, 2008 and opened June 30, 2011, designed for 350 km/h with a fastest trip of 4 hours 18 minutes. California began construction in 2015 and, 11 years on, has no passenger segment open; Merced-Bakersfield targets 2033 and Phase 1 targets 2040. China's network passed 50,000 km by the end of 2025 and carried 3.272 billion passengers in 2024. America's fastest train, the Acela, tops out at 150 mph (160 mph for the next generation) and averages about 81.7 mph between Washington and New York.
2. Bridges. The Bay Bridge eastern span replacement ran from January 29, 2002 to September 2, 2013 — about 11 years 7 months — and cost $6.5 billion, about $8.61 billion in 2024 dollars. The $250 million figure sometimes cited from that era was the price of a seismic-retrofit option, not a rebuild quote. The Hong Kong-Zhuhai-Macau Bridge is 55 km overall with a 29.6 km main section, cost over 120 billion yuan in total (about 48 billion yuan for the main works), and ran from December 15, 2009 to October 24, 2018. Per kilometer, the Bay Bridge span works out to about $1.86 billion against about 2.18 billion yuan (roughly $300 million) for the HZM main section. Geology, function and span conditions differ sharply, so unit costs are a reference, not a verdict.
3. Water. The central route of the South-North Water Transfer broke ground on December 27, 2003 and delivered water on December 12, 2014 — about 11 years. East and central routes together cost on the order of $62 billion officially (about $79.4 billion in some literature), and the Danjiangkou reservoir expansion resettled roughly 330,000-375,000 people. Sites Reservoir, by contrast, has been proposed since the 1950s and remains unbuilt: Proposition 1 set aside $2.7 billion for storage; Sites' cost has risen from $3.9 billion (2021) to $6.2-6.8 billion (2025), with about $1.363 billion committed by the state; its final water-right permit is set for November 4, 2026, with construction planned for 2027 and first water in 2034. The Delta tunnel (about 45 miles) is estimated by DWR at about $20.1 billion versus opponents' $60-100+ billion; its financing was rejected by the courts, no agency has committed, and it has not started.
4. Quality. The HZM Bridge was designed for a 120-year life; the Bay Bridge carries the widest deck in the world and about 270,000 vehicles a day. Beijing-Shanghai HSR has been profitable since 2015, with 2017 revenue of 29.595 billion yuan and profit of 12.716 billion yuan. On the other side of the ledger, the July 23, 2011 Wenzhou collision killed 40 people and injured more than 170, with 54 officials disciplined — the gravest safety lesson in China's high-speed rail history. ASCE's 2025 report card gives U.S. infrastructure an overall C: bridges C (44.1 percent good, 49.1 percent fair, 6.8 percent poor), roads D+, rail B-, with funding gaps of about $373 billion for bridges and $684 billion for roads, against about $351 billion over five years under the bipartisan infrastructure law.
Bottom line. Set side by side, the three comparisons measure different things: high-speed rail tests build speed and unit cost, bridges test cost control on complex works, and water projects test the cycle from proposal to groundbreaking. No single number settles which country builds better — but laying comparable projects side by side makes exactly where the gaps lie plain to see.
来源：GSM·美国（原文链接）
图片来源：2018年5月6日，复兴号CR400AF-2031列车自北京首帕口车场出库。图片：N509FZ，CC BY-SA 4.0，取自维基共享资源。
