Communism is the ultimate team play. Even the ones that are not thrilled by the idea, are forced to join (torture, killings). Also in my country, there were almost no private property. When communists came to power the first thing they did was to steal all the valuable private goods.

When you pool all the resources together you can achieve much greater things. What ultimately happened was that the smart people really wanted freedom and if they don't have it they just stop contributing. Which is why communism China is not the same as the original communism because somehow they realized the flaws in the original design. Long term I believe China will not be the best overall due to this, but the bigger projects like this railroad, are much easier to achieve in any dictatorship.