The Department of Rail Transport (DRT) and the State Railway of Thailand (SRT) conducted a comprehensive test of train operations through the Phasadet and Hinlap tunnels on August 9, 2024. The tests were part of preparations to ensure the safety and operational readiness of the tunnels before the scheduled service resumption on August 12, 2024.
Initial results showed that while dust from cement inside the tunnels has been eliminated, issues with engine exhaust fumes persist. These fumes exceed safety standards and could potentially harm passengers, causing eye irritation and throat discomfort. As a result, it has been determined that the tunnels will not be reopened for train service on the planned date. Trains will continue to use the previous route until the issues are resolved.
In addition to the air quality concerns, the tests also revealed problems with the railway switch points, which are critical for directing trains safely. These issues need to be fully addressed within the next one to two weeks to ensure the safety of future operations.
The SRT is now targeting September 2024 for the resumption of train services through the tunnels, but only for air-conditioned trains. These include four special express services: trains No. 21/22 from Krung Thep Aphiwat to Ubon Ratchathani and back, and trains No. 23/24 from Bangkok to Ubon Ratchathani and back. Non-air-conditioned trains will continue to use the old route for the time being.
To completely eliminate exhaust fumes within the tunnels, the best solution identified is the use of air-conditioned trains. The SRT has begun gradually converting fan-cooled carriages into air-conditioned ones. However, this process will take time, as converting all carriages at once would leave insufficient rolling stock to maintain regular service. The SRT aims to complete the full conversion to air-conditioned carriages within two years.
The Phasadet and Hinlap tunnels are part of the northeastern (Isan) double-track railway construction project, specifically the section from Mab Kabao to Chira Junction. Phasadet Tunnel is the longest in Thailand, stretching 5.4 kilometers. It was initially opened for service on July 28, 2024, but was quickly closed after dust and exhaust fumes from non-air-conditioned third-class carriages filled the passenger compartments, prompting an immediate cleaning and review of safety protocols.
Officials, including representatives from the Department of Rail Transport and the State Railway of Thailand, emphasized the importance of resolving these safety issues before reopening the tunnels to ensure the well-being of all passengers.
