The State Railway of Thailand board approved a 239-day extension for the Thai-China high-speed rail contract 4-3 (Nakhon-Ban PhO section), now ending 26 July 2027, due to Ayutthaya flooding. That extension adds no money for the contractor. Board deferred a combined 2 billion baht cost increase for contracts 3-4 and 3-2 (tunnel and foundation work, geology differed from survey), to be re-submitted next meeting. Relevance for a small business: mainly subcontracting and construction-supply timing in the Nakhon Ratchasima to Saraburi corridor; no action needed now.