...More

I think with the train idea there are two possible options:

1) It could be set in a really old fashioned train staion and the characters could wear really grand, victorian style costumes, maybe filming it in sepia going with the idea of creating a classic thriller

OR

2) It could have a really modern theme showing obvious technology with bright colours and could be set in a deserted typical london underground station which would be really spooky and we could create noises and echoes etc. The lack of windows and naturtal light would also represent entrapment which is a signifier of the thriller genre =D

Whether this is possible or not is irrevelant...I just like the idea. That's all.

Initial Ideas

I have an idea but I'm still really unsure of details. I thought it would be really interesting to do a documentary style opening. I thought a young couple in their teens or a single guy could be filming something with a small camera in a isolated forest area for research or something. He / they would have stumbled over something they shouldn't or have found out something they shouldn't have and are now trying to collect evidence because they know someone/something is after them. You would then keep cutting to very bumpy camera work and hear raspy breathing and the sound of crunching leaves in the forest sort of staggering/running( the villain). There would be a huge build up of tension (i know I'm being very vague, but i did say i was unsure of details) and at the end of the scene the villain would catch up with the guy or the couple and the camera would be dropped in a ditch and the whole screen would go static.
After that, i had the idea that you could cut to a scene about 3 weeks later( it would tell you this) during the day and you would see some feet stop by the camera, which by this time is quite well camouflaged, and see them pick it up.
I know my idea isn't very detailed yet but i really do think it has the potential to make a really original, creative thriller sequence.