Sadly, the fact that it assumes interchanges to be 20 minutes makes it, at least in some cases, far from reality.
At least for the local line of train I most often take (in France), the average time between trains is half an hour, but around 9AM, there is a gap of two hours (on work days) between two trains.
At least for the local line of train I most often take (in France), the average time between trains is half an hour, but around 9AM, there is a gap of two hours (on work days) between two trains.