think about it differently
OK, I personally don't want an explanation of what it means to "dump" a train. I don't need any explanations at all. Do I get explanations in a play? In a movie? Nope, they just show it.
So show it. He yells "I'm going to dump the train," then show the wheels smoking, the g-force, people falling, whatever happens when you dump a train. That's part of the action, and you were going to describe it anyway, right? Who cares what the internal mechanics are?
The fact is, stopping your story to explain a term just blows the reality factor out the window. Like having all the actors in a play freeze while one actor explains to you what a word means. Use the word in the right context, and we'll know what it means.
In general, if someone has 30% bloat due to technical explanations no one is going to read it, right? I might guess 3% explanation bloat is OK. Kind of blunt, but would you read a novel if you knew it was 30% explanation?
I could be totally off base right here, I haven't read your novel, but this is my gut reaction to what you wrote.
Really, the only exception I've seen is some Tom Clancy type novels where the war boys get off on the technical descriptions, but that's a niche market. If you're writing for railroad afficionodos that's a different story.
Some people do have a knack for making technical info sound exciting. There's a Lee Child novel where at least half of the opening chapter deals with the technical description of a New York subway car, but he does it deliberately, as a contrast to the action that's going on at the same time. If you can write like Lee Child, go ahead.