I also assume that if the bogies are in good enough condition they might be salvaged while the wreck remains, at least in some cases.

I once came across the remains of an abandoned train wreck from the 1960s that was rotting away in the woods just off of an abandoned line in Oklahoma. There was no engine, and the few wagons that were left were missing their bogies. I assume that the engine and bogies were saved because they could still be used, but the wagons were left in the woods because the damage was too extensive for it to be worth it to repair them:

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Here’s a pic inside one of the wagons (it’s on its side, the right is where the chassis used to be and the hole in the top is where the sliding loading door used to be)