Source:
Due to the COVID-19 pandemic situation, during which several provinces have been locked down and temporarily ban traveling in and out of individuals, vehicles, and goods at permanent crossing points, border trade service centers, and other channels along the border areas, the Customs Department informs that transport, import and export of goods through the border nationwide can be done as normal in accordance with related laws and regulations, and the regulations set by respective provinces. Source: https://www.thaigov.go.th/news/contents/details/28378
Passenger trains have been suspended. However, freight trains between Thailand and Malaysia continue to operate. Source: http://cccovid19.mot.gov.my/
Thailand has reversed its ban to close four ports (which was imposed on 21/3/20) at the Mekong River to allow for cargo shipment. The operations of the ports are however limited to only three days a week. Travelers are still not allowed port entry. Source: https://www.mcot.net/view/5e85d357e3f8e40af1428801
Port remains operational with Covid19 related measure undertaken based on International Health Regulations (IHR) 2005; checkpoints established. Source: www.port.co.th/cs/internet/internet/index.html