After running some tests in a sandbox map, I found that only a select few types of cargo would trigger a crash (Aluminum, Goods, Logs, Lumber, Rubber, & Steel). All other types of Freight cars, Express cars, Dinning cars, & Cabooses didn't trigger a crash, nor did any type of pre-1950s railcar.
I figured RT3 might have accidentally deleted some of the files for the post-1950 freight cars when I installed the Coast to Coast & 1.05 Patches (as well as a few custom maps and locomotives). So I reinstalled the game from the disk, booted it up without any mods, and ran a test in a sandbox map.
And...it crashed, again.
![frustration !hairpull!](./images/smilies/hairpull.gif)
Anyone have a solution to my problem?