The entrances to the Classic Inca Trail are marked according to the kilometers on the railway between Cusco and Aguas Calientes. For example: “km 104” is 104 kilometers from Cusco on the way to Aguas Calientes.If doing the four or five day trek, you will start at km 88 or km 82, which is a short train or car ride from Cusco.
If doing the two-day trek, you will either take the train from Cusco or Ollantaytambo to km 104 where you will start your trek.