Alex,
You could take a tour of the second largest BNSF yard in the country, in Galesburg, IL during the annual Galesburg Days which is usually during the 3rd or 4th weekend in June. During Saturday & Sunday, there are tours of the yard in cramped school buses, which leave every 30 minutes, from the downtown Amtrak station. The bus goes through the BNSF yard, around the maintenance facility & over a bridge that gives a view of the entire yard. You cannot get off the bus but there are BNSF retirees who announce the history, various parts of the yard & answer questions.
But on Friday & Saturday evening around 3:30, there was just 1 extended tour of the yard where you were allowed to get off the school bus to go into the diesel repair shop, hump yard control tower & a Q&A session with an Operations supervisor inside a building. This tour could last up to 3 ½ hours, but there is no advanced reservation, first-come-first-served basis up to 30 people, or however many could fit inside a school bus. When I took this tour 2 years ago, I got there 30 minutes before the start of the tour but could only get the last ticket on the bus. The line ahead of me looked like the line outside Best Buy on Black Friday, with people sitting along the curb in folding chairs before they started selling the tickets. Here are some photos I took during the tour.
These are just my opinion,
Thanks,
Naveen Rajan