Easiest way is to get the train info papers from the train crews directly. They show the exact number of cars on the train. Number of loads and empties. And what types of cars. This isn't so easy unless you know the crew or the crew is friendly.. And since when the train reaches it's destination the papers get thrown away since they are now useless, they are hard to come by in general.
Main types of freights.
- Manifest: Can consist of pretty much anything that runs on rails. Boxcars, flatcars, gondolas, hoppers, etc.
- Unit: A entire train made up of a single commodity. Coal, Ethanol, Grain, Autoracks, etc.
- Intermodal: TOFC (Trailer On Flat Car), COFC (Container On Flat Car), Double Stack Containers.
Less Common Moves.
- High-Wide: When something really big or really long needs to be moved and it can't go onto a normal manifest.
- Military Moves: Exactly like the name suggests. Bunch of military equipment on DODX (Dept of Defense) flatcars.
- Lite Engines: Bunch of locomotives being moved across the system to balance power, so no one terminal is power short.
There is no set "Standard" to train length. Unit trains are the most uniform since they run from point A to B and return with very little switching. Most unit trains are around 80-110 cars long.
Also for note. Unit trains carrying dangerous / flammable cargo. Ethanol for example. The train
MUST have a buffer (idler) car on each end (can be anything other then a flatcar. Boxcar, Covered Hopper, etc). Ethanol is a Class 3 Flammable liquid, as such the hazmat rules require only 1 non placarded buffer/cover car for loads, and none for empties or residue cars if it is runs as a unit or single commodities train. In a manifest freight it would have to ride at least 5 cars back / away from any occupied engine or caboose. (
http://fogchart.com/Down/STUDY/2011%20H ... source.pdf)
Trying to copy what you see in a video is unrealistic and not prototypical just for the fact that freight train length and make up has to do with what traffic level warrant. I'll give an example that I witnessed last year on CSX:
Q117 is a Intermodal train that runs daily from Boston to Chicago. One day it was 17,000 ft long fully loaded with containers. Next day it was only around 4,500 ft or so half the train empty returning well cars back west. Another would be Q380 a daily manifest from Chicago to Selkirk, NY. First day it had around 150 cars. Mostly made up of boxcars and grain hoppers. Next day it was around 85 cars with a mix of everything. You name it it was on the train. I've also seen just engines on a train. It was symbol-ed as a normal manifest, yet it had no cars what so ever.
If you want actual train symbols (Q117, Q380 on CSX for example). I could get a list for every railroad. UP, BNSF, CSX, NS, CP, CN, etc.