My one picture, my reskinned BL2 with Joram's GP trucks.
Then I wanted the same truck but with less rusty wheels so I changed the colors of them. Also made it a bit darker. I put these on GP40s to see how they looked and uploaded that version of the bogey to DLS.
While I don't have pictures, I have used Magicland's trucks from the C424/425s on C420s (nothing uploaded of course).
I have read that some railroads used different trucks for various reasons including:
1 - trading in one builder's locos for another but using the traded trucks on the new stuff, like EMD trucks on Alcos, Alco trucks on GEs, etc.
2 - the railroad wants the new engine but doesn't like the stock trucks so they ask for or acquire others.
3 - the railroad runs out of parts or the builder goes out of business so other builder's trucks are used for repairs.
I would like to know what I can use for the 2004 built-in ATSF-type passenger cars, I downloaded some other cars but I cannot stand the defaults nor find bogies that fit right. And I am still sorting through rolling stock to see what looks good especially between 33x68 and 33x70 sizes. Plus the F40PH bogies suddenly don't work for me even when redownloaded, I keep getting animation error messages for those and a few others.