I think your shot is a good shot, but not great.
The thing that jumps out at me in comparing the two photos is the crisp focus and lighting on the nose of the CNW unit. The lighting is dramatic. The sun angle is very low and explodes the nose of the unit. Also, note the difference between the the light and darkness on both photos. On the accepted unit there is a certain level of mystery surrounding the train. Not so much with yours.
Also, either your shot is slightly out of focus or the lighting doesnt do you justice (I think that is the case).
Personally, I enjoy the high quality of railpictures. They set the bar very high. I look at rrpictures when I want to see volumes of pictures, generally at a single location. Most of the photos there are of much lesser quality.
Now, having said all of that…I have only had 2 photos every published and that was 30 years ago. I dont try. I know the amount of hard work and LUCK that goes into a great railroad picture. I am not that good, dont have the time, and am almost always disappointed when I see my end results.
I like your shot. I like it a lot. Why? Because it shows one of my favorite objects…a tower. Not only that, but it is an active tower with the towerman observing the train.
I have used crossing gates to compose shots in the past and have generally been disapppointed. It would work if you were stopped down to about f4 and the gate was “out of focus”. In other words use it as a frame, and not as a focal object.
My suggestion is to go back to West Chicago early or late on a crystal clear day and compose your shots. Plan them out. Accept your final result but have a critical eye to what could have been better.
If I remember correctly, you are 16 years old or so. You have a fine future ahead of you. My train shots at that age were BAD, really BAD!
Dont worry about rejection. Actually get used to it. It is a fact of life.