I don't know whether this Youtube has been aired here before (it's over 5 years old) - I tried searching but hampered a bit by search requiring 3 or more characters per word so can't use "O Gauge".

Anyway, here it is, video of a model train with over 100 freight wagons.  It's rather long, but the "action" starts at 8:45 in.
 
Sadly, it's not N gauge  .


https://www.youtube.com/watch?v=q672YB7Hxbc

 

'nuff said.

Jill & I got caught on the wrong side of a BNSF freight when we stopped for gas just off I-10 in Banning. I was told that we had a good half-hour to wait. Funnily enough there was a very friendly roadhouse right next door. 

@emjaybee will should know*, one of the pleasures of the LA-Las Vegas drive is the few miles up and over the Cajon Pass and watching the freight trains on the Barstow-San Bernadino trip winding up or down the 3,000 odd feet. There's a nasty 3% down gradient westbound on the southern track for a few miles after the summit. That's a lot to hold back if you're the engineer.

* He should know, but he drove that trip in the dark, so missed it.

See here for the longest N Scale train: https://model-railroad-hobbyist.com/node/21732. 1103 cars with five engines and ran for 18 laps. That was about 189 scale miles. The Cotton Brute had a chassis made from depleted uranium (I think Jim FitzGerald worked for NASA).

See also here: https://groups.io/g/n-scale/topic/the_longest_n_scale_train/74538756?p=