Here’s a possibility for a Trainwreck cross to trade for, @newb2.0 made some Spirit Train F2s, that’s Trainwreck x Kashmir, could be a good cross if not a BX:
Also these folks out of Oregon work a few strains that all kinda start with a Trainwreck x Purps cross from the old medical collectives, they have a bunch of $15 packs and this big box of stuff for $50, some of which is a little old but probably well stored and totally viable:
https://www.strainly.io/en/listings/400634-cannabeizein-project-overgrow-2020-collection