Catalyst is a main story mission in GTA San Andreas, given by Ryder.
It's the 12° GTA San Andreas mission in chronological order, and it takes place in Los Santos.
Carl and Ryder steal crates of cargo from a train.
Catalyst: Mission Objectives
- Drive Ryder's Truck to the ammo train.
- Shoot the Vagos robbing the train!
- Protect the train from the Ballas!
- Climb onto the back of the train.
- Use the nearby pay 'n' spray to lose the cops.
- Take the crates back to Grove street.
Catalyst: Mission Info
- Mission Number 12
- Mission Type Mandatory Mission
- Mission Giver
Ryder - Location Ryder's House (Ganton); Pay 'n' Spray
- State / Area Los Santos
- Rewards Respect +
- Featuring
Freight (Train) 
Greenwood 
Picador 
Eddie Pulaski 
Frank Tenpenny 
Jimmy Hernandez Ryder 
C.R.A.S.H. 
Grove Street Families 
Los Santos Vagos 
The Ballas