MAC-10 | Derailment is a Restricted-tier SMG finish, part of The Train 2025 Collection and dropped from the Austin 2025 Train Souvenir Package.

The float range for this finish is restricted to 0.00–0.70, so Factory New, Minimal Wear, Field-Tested, Well-Worn, and Battle-Scarred are the only obtainable conditions on the open market. The restricted range is set by Valve at the time of release.

A Souvenir version is available, dropped exclusively from cases collected during Major Championship matches and stamped with that tournament's stickers. Active listings for MAC-10 | Derailment are tracked across 17 marketplaces, with prices spanning $2.88 to $55.81 depending on wear, variant, and seller.