Sea Sky Cargo is a freight forwarder for both Nepal and Bhutan as well as other South Asian Nations. Nepal and Bhutan are landlocked countries, Kolkata Port in the state of West Bengal, India is the only gateway port for both.
The goods/containers are transported by Indian number plated trucks/trailers to the Bhutan border-customs (Phuenstholing), transshipped in Bhutanese trucks and then transported to other parts of Bhutan. Only 20’ containers for project cargo are permitted to transport to Thimphu, however, it is not encouraged due to additional cost, time and special permits. 40′ containers cannot be transported inside Bhutan due to road conditions.
Goods/containers are transported by Indian trailers /trucks to different Indian/Nepal border-customs and the same Indian plated trucks and trailers can move with the containers to the destinations inside Nepal.
There is an ICD (Inland-container depot) where the goods are transported to and from India (Kolkata Port) via the Birgunj dry rail port, which is the key terminal of surface cargo delivery to Nepal. But this is not reliable and therefore generally not recommended.
Customs clearance is done in Kolkata Port, Indian Border customs, and Nepal border customs.
Nepal business is mostly in India and occupies 70% of the trade with India. The trade relationship between India and Nepal has a very long history.
Here, You can see the dozer being transported by Nepalese truck heading towards Bhutan.
For Glimpses of The Nepal-Bhutan Project Handled By Sea Sky Cargo Service : https://seaskycargo.com.np/photo-gallery/nepal-bhutan-project/