Since the opening of the China-Laos Railway, the transit time for durians shipped from Southeast Asia to China has been greatly shortened. Nevertheless, rail transport differs fundamentally from ocean shipping. Featuring shorter travel time, drastic temperature variations and numerous customs checkpoints, it imposes entirely different requirements on durian transport containers. An inappropriate container may lead to over-ripeness or chilling injury of durians upon arrival, resulting in a persistently high cargo damage rate. For dedicated rail transportation, container selection shall be based on three core indicators.

Temperature control is the primary mandatory criterion for cold chain equipment selection. Rail journeys generally take only 3 to 5 days, so the temperature control strategy for rail containers varies from that for marine units. While marine reefer containers prioritize long-term stable operation, rail containers are designed for rapid cooling and precise temperature regulation. Freshly harvested durians continue to respire, causing a steady rise in core fruit temperature. The container must bring the core temperature down to below 13°C within 2 hours after loading, and keep the overall temperature fluctuation within ±1°C. In this scenario, the response speed of the refrigeration unit matters more than its cooling capacity. Conventional units have slow cooling performance and may fail to meet standards even if started six hours prior to loading. Reefer containers specially built for rail durian transport are normally equipped with high-power self-contained refrigeration units, which boast quick startup and powerful cooling performance to adapt to short-haul and high-frequency rail operations.

With temperature well regulated, humidity and gas composition also play vital roles in preserving durian quality. Durian peels have poor air permeability. Excessively low humidity inside the container will cause the flesh to lose moisture, whereas overly high humidity will trigger mold growth. A relative humidity range of 85% to 90% is optimal. In terms of modified atmosphere (MA) management, lowering oxygen concentration and raising carbon dioxide concentration can slow down the respiration rate and delay the ripening process of durians. Given the short transit time of rail transport, the MA system does not need to operate at full capacity; maintaining oxygen concentration between 5% and 8% is sufficient. Excessive atmosphere adjustment will conversely cause unpleasant odours in the flesh. This parameter should be fine-tuned according to durian varieties and their ripeness levels.

The China-Laos Railway stretches across tropical and subtropical zones, bringing about remarkable temperature differences along the route. Therefore, containers must be fitted with sufficiently thick thermal insulation layers and reserved refrigeration margin. Additionally, rail transport generates higher vibration frequency than sea freight, so the floor load-bearing capacity and anti-slip design of containers cannot be overlooked. Durians are heavy per piece, and those at the bottom of stacks are prone to cracking under compression. Insufficient floor strength will lead to severe cargo damage upon arrival. Customs clearance also requires attention: container dimensions must comply with railway loading gauges, as oversized units will be held up at border ports.

In essence, selecting reefer containers for durian transport on the China-Laos Railway is to strike a balance between temperature response, modified atmosphere precision and physical adaptability. Containers that deliver rapid cooling, stable humidity control and strong vibration resistance will effectively cut down cargo damage. When making a choice, do not focus merely on rental costs. The compatibility between technical parameters and actual rail operating conditions is the decisive factor. Strict quality control for durian transport starts right at the container selection stage.

CIMC Qingdao Refrigeration Industrial Base was established in 1999. It is dedicated to designing and manufacturing ISO-standard reefer containers and producing customized refrigeration and insulation specialty products. Its customers span major global logistics systems, including North America, Europe, Asia, and Australia. The base's products cover application scenarios across the "sea, land, and air" supply chain systems, providing full-process equipment manufacturing solutions for cold chain equipment — from pre-cooling at production origins and manufacturing to midstream logistics transportation and last-mile warehousing. For more information about our reefer containers for durian transportation, we warmly welcome your inquiry.

Address: No. 66-68 Xiangjiang Road, Jiaozhou City, Qingdao, Shandong Province

Telephone: +86-532-86687388/+86-532-86687636(Aviation Container)

E-mail: customer_service@cimc.com yunfeng.bi@cimc.com (Aviation Container)

Website: www.qdcimc.com