http://www.sciencealert.com/meet-solar-express-the-space-train-concept-that-can-get-to-mars-in-two-days

This seems like the dumbest idea to have come along in years🙂

Getting to 1/10th the speed of light? in 2 days? Well, 1 day
even if the 'train' is going that speed, the cars still have to accelerate up to that velocity to catch a ride.

A craft accelerating at 1 g for 3 days and then decel for 3 days gets there in 6 or 7 days but 2 days at that rate would take something like 3 g's for the whole trip, half way accel, rest of the way decel.

I think they have been eating too many magic mushrooms.