The primary mode of public transportation within Sikkim is:

The primary mode of public transportation within Sikkim is bus. Buses are the most common way to get around the state, and they connect most of the major towns and villages. There are also a few private taxi services, but they are more expensive than buses. Rickshaws are not a common mode of transportation in Sikkim, but they can be found in some of the larger towns.

Here is a brief description of each option:

• Train: There is no train service in Sikkim.
• Bus: Buses are the most common way to get around the state, and they connect most of the major towns and villages.
• Taxi: There are also a few private taxi services, but they are more expensive than buses.
• Rickshaw: Rickshaws are not a common mode of transportation in Sikkim, but they can be found in some of the larger towns.