[Hargrave]

You shall put them in OnGameModeInit. For you it will be like this:

public OnGameModeInit()
{
CreateObject(19450, 3460.79, -2769.31, 1054.58, 0.00, 0.00, 270.36);
CreateObject(19450, 3469.72, -2768.99, 1054.58, 0.00, 0.00, 270.36);
CreateObject(19450, 3470.26, -2741.03, 1054.58, 0.00, 0.00, 270.36);
CreateObject(19450, 3460.62, -2741.11, 1054.58, 0.00, 0.00, 270.36);
CreateObject(19450, 3451.36, -2741.16, 1054.58, 0.00, 0.00, 270.36);
CreateObject(19450, 3441.48, -2744.78, 1054.58, 0.00, 0.00, 0.95);
return 1;
}

For more information about it, please take a look at SA-MP Wiki about CreateObject.