In a Facebook post on Friday (Oct 20), Mr Natthapon Asswisessiwakul thanked the train captain - whom he identified as Mr Sai Yusoff - for handing the wallet over to staff at Tanah Merah MRT station.
The Bangkok-based Mr Natthapon was on a business trip on Tuesday, but it turned into a "nightmare" when he dropped his wallet, which contained credit cards, shortly after landing at Changi Airport.
"Could you imagine, losing wallet, credit cards and other necessary belongings overseas upon arrival - and a serious meeting is waiting for you in the next hour," he wrote.
SMRT told The Straits Times on Friday that the train captain in question is Mr Muhammad Faisal Mohd Yusoff, who has been with SMRT Trains for four years.
Mr Natthapon said Mr Faisal's actions made his day and "the whole trip became wonderful".
"In addition, you make me really trust the country of Singapore," he added.
Responding to to Mr Natthapon's Facebook post, SMRT thanked him for taking the time to share his appreciation for Mr Faisal.
Several netizens praised the train captain, including Facebook user Cheong Kit, who wrote: "Mr Sai Yusoff, all Singaporeans are very proud of you! Well done!"