Complete Train Runner before the train arrives at the station
In order to even complete Train Runner, you need to shoot for about a 36 second completion time(though it varies*), and in order to beat the train, you need to finish about a second/second and a half faster. Do not worry if you are really close to finishing and you hear the trains brakes stop, as there is still a fraction of a second of leeway between when the train's brakes stop, and when you must complete the challenge. Only once you have crossed the white threshold and the challenge complete screen comes up, will the achievement pop for you.
*The time needed to beat the train seems to vary player by player. Whether that is the games mechanics, or it's a glitch is unclear.
Head straight from the start, blink to the back right so you can go through the table and end up passed the covered area. Keep going RIGHT, agility jump up to a roof covering a purple lantern area, and blink from there down to the lower area. Jump the small gap (this area has the giant wheels on Expert), then sprint up the slope. Follow the video from here until you reach the train station. Once you reach the station; from the staircase, blink on top of the small structure in front of you, and then blink straight ahead to the roof above the trains tracks that is between you and the finish line.
You can also check out this great video by xK Marcus.
I tried this many times and always beat the train but never got the achievement. A friend of mine told me to go through the little side opening beside where the train stops and I got the achievement first try. If you can't get it to pop, try that.
I think I may have just figured this one out. If you choose to go over the building at the very end if the level (the one the train stops in) you MUST touch the ground BEFORE crossing the finish line. As long as you do that and cross the finish line before the screeching sound from the trains brakes stops you should get it. Confirmed it by making a new gamertag and got it the first time. Hope it helps.
near the start when running under 2 pipes you come to a part where there's a purple room, 2nd floor on the right, and a short stair in front with a closed gate/metal fence. blink enough to reach this gate/fence before the train and get on top of the gate, turn left to face where the train will pass you and with a little jump and blink (practice required, or luck) you can get on the train. frome there the achievement is easy.
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