Sources: The Washington Post, Shutterstock
quote: Your 4,000 ton diesel-hauled freight train trundling along at 40 mph can have every single truck shaped like a brick and it will make no noticeable difference to efficiency. ... Your 400 ton electric-powered 200 mph passenger service is an altogether different story... The overall energy usage depends almost entirely on how much energy needs to be spent maintaining a high speed, and that is determined by how much rolling-resistance and aerodynamic drag it experiences.
quote: A long pointy nose might not be viable on a plane for weight (weight == fuel usage on planes) and weight-distribution reasons, but a couple of extra tons on the front of a train costs nothing compared with the rest of the weight and can help it cut through the air that bit more efficiently. Don't judge how trains should look by how planes do.