Cambodia is known for its network of inland waterways. Historically used for domestic trade, these waterways (including the Mekong and Tonlé Sap Rivers) also play a major role when it comes to passenger transportation. In the 1980s, most navigation routes on the Mekong River were cleared for traffic and different ferry services were restored. They not only allow you to reach various islands but also different towns along the rivers. In fact, some villages still largely depend on the waterways for transportation. However, you should keep in mind that boat trips might take some time and are not always the safest and most convenient option.
The railway system, once an important means of freight and passenger transportation in Cambodia, suffered from neglect and major damage in recent decades and was finally suspended in 2009. The French colonial government originally built the first line, with a second one being added in the 1960s. Although there are currently no passenger trains to get around Cambodia, there are definite plans to restore the railway system and some route sections are planned to open in 2014 and 2015. If you like to travel by train, it makes sense to check back every now and then to find out if traveling by train is, in fact, possible again.