Can Machu Pichu by car be done all year round?
No, the recommended dates are from April to October, since these dates there is little fluvial precipitation, if you are wanting to make this route in the months of December to March inform yourself well, if it is accessible to make it, since in these months there is heavy rainfall.
How much does it cost to return by train?
the cost is generally between US$ 50.00 to US$ 70.00 dollars, depending on availability and promotional fares of the railway companies.
Can I do the Huayna Picchu Trek with the Trip to Machupicchu by Car?
It is not recommended since there is a probability that you will not have enough time to return to the hydroelectric plant, but if you are one of those who has a good physical condition, you could do it.
It is recommended that if you want to do this route, you choose to return by train to Ollantaytambo and make the most of your time in Machu Picchu.