Haven’t you read what I wrote above? Download the Train Fever patcher, tick both “Allow to upgrade streets” and “Allow to delete streets” and voilá… Was it hard? Please, let’s talk only about performance to force them to do it, that is the biggest issue. Otherwise the devs will add more and more functions (demanded by the community), because it is easier than rewriting the code. Functions are great, but don’t bring playability.