[lotsofpulp]

It is possible that the train lines can be built in insufficiently dense areas to make it worth using, and it can be possible that the roads are designed too wide/too numerous/etc.

Just because a government builds it does not mean it is worth it for society. And if it was worth it at time X, it does not mean it will be worth it at time X+1.

See the multitude of comments and threads about living in communities with work and play in the same community, as opposed to driving 30min each way from a suburb to a work area and back.