The second set of four views seems to be the same as the first set. Remember that there are eight different
views. Look at the pantographs on my Rc1 (which seems to be the origin of your sprites). This may also explain why you turned off the lights
You have made the wheel part (lower 2 lines) very
dark. It might be better to leave realism aside, and mix with some lighter grays there to simulate some detail. In your picture above of 41-01-2, it definitely looks like some round tanks in lighter gray in the middle.
The snow plows are separate (one on each side) on Rc but, judging from your picture, yours should have no gaps in the diagonal views.
The sixth image also has a double bottom line.
If it is indeed the Rc1 which is the origin, please remember that it was the first train I drew, it is not very good shading-wise, all the sides of the engine have more or less the same color, irrespective of which side is turned to the sun. It looks better if the lighted side (right) is a lighter nuance, and the shaded side(s) darker, makes the edges more obvious. But I hadn't learned that at the time...
Some people will suggest 'randomizing' the color of big, uniformly colored surfaces, i.e. mixing pixels with slightly different colors to make a more textured surface. I find that very difficult, so my trains are mostly 'flat-colored'. You have been warned