It looks like you already took all this traumatise-other-people thing into consideration. There isn't really much you have to think about other than that.
Normally, trains slow down when driving through a station, so I wouldn't do it directly at the station, rather a few kilometres further away.
If you want to lay your head on the tracks, then you have to take the
Cowcatcher into consideration, which should be installed on nearly all trains. Only the height will be different, so look out for that.
The braking distance is also important and made up of various factors. If the locomotive is heavy or is pulling a lot of wagons, the braking distance can increase considerably. Are the rails wet or dry? If they are wet, the static friction decreases and the braking distance also increases, so I would do it on a rainy day. A train running 220 km/h has a breaking distance of about 1.5 km, which should be more than enough.
The force you will feel on impact with a train, which is 417 tons heavy and running 210 km/h, will be around 202 mega Newton. That's quite a lot.
But this method really isn't the best one. If you have another method, please use that one instead.