Now to get on with the strategy, once the player has gotten a hold of a Brown Streak or a Freight, start moving at speed and then press the submission button. This usually occurs at the speed of 47.5, which is why it's suggested to go around 45. It is safe to go up to 47, but if one doesn't control the amount of momentum the train is holding when the player is at that speed, one could very easily derail.
While traveling to each station, the maximum speed the player should be going at is around 45. (To be precise, Carl has the option of riding in a passenger car of a Brown Streak rather than jacking the engine, which is the option prior to completing the mission.) Completing the mission is required to achieve 100% completion.
The challenge is completed when both levels have been completed it is failed when either the train is derailed, the time limit expires, a station is missed, if the vehicle is abandoned or if the sub-mission button is pressed. Like most side missions, it is activated by pressing the sub-mission button. The challenge is available after completing Yay Ka-Boom-Boom. The mission involves the player transporting freight around the state in a Brown Streak or a Freight under a time limit.