Works best with a party but can easily solo 10+ hour steel path survivals. Remember to drop a [Flechette] grenade or 2 under the vortex, they will make quick work of the weaker enemies that get pulled in. You don't need the Protea Dispensary, it just helps with the archgun ammo, and is quite nice for the free health/energy as well.
Trainwreck Primes arsenal:
Kuva Bramma - BIG. FUCKING. EXPLOSIONS. Perfect for shooting into the meatball of enemies created by the vortex, Toxin/Cold base element works best. build here https://overframe.gg/build/135496/kuva-bramma/explosions-toxin-base-viral-blast/
Acceltra - Easily one of the best guns in the game and a good replacement for the Bramma if you don't have one, build here https://overframe.gg/build/130330/acceltra/meta-slave-viral-slash-acceltra/
Arca Plasmor - Because shotgun, nuff sed, build here https://overframe.gg/build/139945/arca-plasmor/nuka-plasmor-steel-path-viable/
Kuva Nukor - You didn't need to be told this, you already knew, and you knew why, triple status build here https://overframe.gg/build/133804/kuva-nukor/heat-rad-viral-co-primer/
Pyrana Prime - When you want nothing left alive - https://overframe.gg/build/152124/pyrana-prime/the-hand-cannon/
Gram Prime - For when the acolytes decide they are ready to give you steel essence, build here https://overframe.gg/build/133809/gram-prime/big-sword-insane-red-crits-insane-status-chance/
If you have access to the archgun deployer, Mausolon, nuff sed, build here https://overframe.gg/build/129383/mausolon/full-sweat-mausolon/