Elon Musk provides new details on his 'mind blowing' mission to Mars, Washington Post
"Essentially what we're saying is we're establishing a cargo route to Mars," he said. "It's a regular cargo route. You can count on it. It's going happen every 26 months. Like a train leaving the station. And if scientists around the world know that they can count on that, and it's going to be inexpensive, relatively speaking compared to anything in the past, then they will plan accordingly and come up with a lot of great experiments."
"Musk said 2022 would mark the first use of the Mars Colonial Transporter, a spaceship that's big enough to carry scores of people to Mars. The first MCT would be uncrewed. However, it's plausible to think that the craft could be pre-positioned at Mars to support the crewed mission to come, and the return trip to Earth. That's the part of the plan that's still fuzzy."