to do it just stay on this bit of the tracks and he is doing on the mission all the way long
http://www.gtasanandreas.net/screenshots/gallery.php?image=581
just do what this guy is doing stay on that bit of the tracks and your get past the mission in no time
hoped that helped
my gang
,me,eedledeedle, Mr.Sparkle,matty dawkins,big smoke,oober,certified gangster,RICH95419, GT4 Maxie,luckyluke