Travel to Ollantaitambo

Bus

There are frequent buses to and from Urubamba (2 soles); further connection can be made to Cuzco there (3 soles). At 3:50PM, 4:40PM and 5:20PM there are direct buses leaving from Av Grau 525 in Cuzco (5 soles). (how much time does this trip take, more specifically? i who ask would guess ~3hrs, up to ~4 if you need to make a change on the way)

Rail

Two types of trains arrive at the station. The first is locals only that is heavily monitored to ensure no tourists ride it. There are hefty fines if caught on the locals' train. The second is the tourist train which runs Cusco/Ollantaytambo/Aguas Calientes. If you are doing the Inca Trail, you will want to get on the train to Aguas Calientes and get off when the train stops mid-route.

There are three types of tourist trains. Ordered by descending price, they are the Hiram Bingham, Vistadome, and Backpacker trains. Go to Peru Rail's website for the current prices and schedule.

If you purchase a ticket from Cusco to Aguas Calientes, you cannot get off at Ollantaytambo for a few hours and then use the same ticket from Ollantaytambo to Aguas Calientes. If you want to spend time in Ollantaytambo, it is more cost effective to take a bus to Urubamba from Cusco and then a connecting bus to Ollantaytambo (or a direct minivan).

 After Trekking to Machu Picchu

Many guide services include a train ride from Aguas Calientes to Ollantaytambo or all the way to Cuzco as a part of the guided services. In the former situation, trekkers are expected to pay for their own bus from Ollantaytambo to Cuzco and are informed of this in advance