Thanks for posting that! (I think we had a discussion of nuclear-powered locomotives a while back, but at the time nobody came up with much in the way of 1950s documentation. I vaguely remember seeing an article in "Popular Mechanics" or "Popular Science" when I was a kid.)
Setting aside the sheer unacceptability of running a nuclear reactor along main-line railroads… (Maybe it could be used on an all-new line that ran exclusively through deserts, with trains switching to conventional locomotives at the ends of the new line before reaching populated areas?(*)) How practical would it be? I don't know enough about nuclear power plants to comment on the "engine" design, but purely in terms of railroad operations...
What's striking about it is how conventional the final drive is. We've got about the same power as a four-unit lash-up of F units (or FA/FB units if you want it to be an Alco-GE product), on the same number of powered axles, with comparable weight per axle. (The unpowered truck at the tail end of the "tender" is extra.) The "tender" is a reasonable design: it will look familiar to anyone acquainted with the South African Class 26 4-8-4 condensing steam locomotive. So I'll give a passing grade on that part of the assignment: student has adopted existing technology in a straightforward way to provide the needed condenser capacity to allow efficient use of a steam turbine.
The "A unit," on the other hand, gets a D-minus. 38 meters long! That's almost as long as a Union Pacific "Big Boy" engine AND tender. No way is a rigid-frame vehicle of that length going to be acceptable on a railroad with normal curves.
The artwork in the sources linked by your link is fun. "Life" magazine's artist had obviously been looking at EMD units: the nose and the 3-axle trucks look E-unit-ish. The nose in the drawing at the first link, on the other hand, is a bit more Alco-ish.
(*) The former Soviet Union had a horrifyingly tolerant attitude toward environmental damage and danger, and parts of the Trans-Siberian Railway go through pretty isolated territory, but somehow I don't think there would have been an American project in the 1950s to design a high-tech locomotive … for export to the Russians!