2021 Train Collection (CS2)
Every skin in the 2021 Train Collection by rarity, the float range of each, and exactly what each rarity trades up into.
The 2021 Train Collection has 17 skins (2 Covert, 3 Classified, 5 Restricted, 7 Mil-Spec) and was released in 2021. Its rarest skins are Glock-18 | Gamma Doppler and M4A4 | The Coalition.
Operation Riptide (September 2021) collection, bought with stars earned from operation missions; the rarity tier was chosen when redeeming.
Weapons in this collection: AUG, AWP, CZ75-Auto, Desert Eagle, FAMAS, Glock-18, M4A1-S, M4A4, MAC-10, MP5-SD, Nova, P2000, R8 Revolver, SSG 08, Tec-9, UMP-45, USP-S.
All 2021 Train Collection skins
Every skin in the collection by rarity, with the float range each one can have.
Covert 2 skins
Classified 3 skins
Restricted 5 skins
Mil-Spec 7 skins
Cost of a trade-up in the 2021 Train Collection
| Inputs (10x) | Cheapest input | Lowest price | 10 inputs from |
|---|---|---|---|
| Mil-Spec | UMP-45 | Full Stop BS | $1.11 | $11.10 |
| Restricted | CZ75-Auto | Syndicate FT | $3.83 | $38.30 |
| Classified | FAMAS | Meltdown WW | $19.43 | $194.30 |
Lowest listing across up to 11 marketplaces in the CS2TradeUp.gg price feed, without StatTrak or Souvenir, checked on 2026-11-11. Prices change every day, so open a skin for live prices.
2021 Train Collection trade-ups
A trade-up contract takes 10 skins of the same rarity and returns one skin of the next rarity, from the collections of your inputs. Valve doesn't publish the exact odds; calculators and most guides use this model: each input gives its own collection a 10% share, and inside a collection every skin of the next rarity is equally likely. On that model, with all 10 inputs from the 2021 Train Collection each possible result below has the chance shown; with 5 of 10 inputs from here, halve it.
Mil-Spec x10 → Restricted: 20% each (float range in grey)
- AWP | POP AWP 0.00–0.44
- CZ75-Auto | Syndicate 0.00–0.70
- MP5-SD | Autumn Twilly 0.00–0.58
- Nova | Red Quartz 0.00–0.40
- P2000 | Space Race 0.00–0.60
Restricted x10 → Classified: 33.3% each (float range in grey)
- FAMAS | Meltdown 0.00–0.40
- MAC-10 | Propaganda 0.00–0.62
- USP-S | Whiteout 0.06–0.80
Classified x10 → Covert: 50% each (float range in grey)
- Glock-18 | Gamma Doppler 0.00–0.50
- M4A4 | The Coalition 0.00–1.00
- The Covert skins at the top of the 2021 Train Collection can be reached by trading up Classified skins. The 5-Covert knife and glove trade-up gives a knife or gloves from the collection of one of its inputs, and this collection has none, so its Covert skins don't work there.
StatTrak: none of these skins exist in StatTrak, so every trade-up into this collection uses non-StatTrak skins.
The float of the result depends on the floats of your inputs and the result's own range: see how the trade-up float is calculated and how trade-up contracts work.
All collections: CS2 collections list.
Frequently asked questions
What skins are in the 2021 Train Collection?
The 2021 Train Collection has 17 skins. The rarest are Glock-18 | Gamma Doppler and M4A4 | The Coalition (Covert).
How do you trade up into Glock-18 | Gamma Doppler and M4A4 | The Coalition?
Use 10 Classified skins. With all 10 from the 2021 Train Collection, each of the 2 Covert skins has about a 50% chance on the odds model calculators use.
Where do 2021 Train Collection skins come from?
Operation Riptide (September 2021) collection, bought with stars earned from operation missions; the rarity tier was chosen when redeeming.