Rugby and Crewe stops I think in addition to those mentioned above.
QUOTE (dwb @ 15 Dec 2008, 23:14) <{POST_SNAPBACK}>Did you get an impression of going backwards in some of the foggy bits?
Your visual system gets conflicting evidence due to the fixed timebase video sampling of the image and the varying speed of the train. The most regular part of the view is the OHL posts, and the sampling rate / train speed combination determines whether these are perceived as advancing or retreating. (Same effect as spoked wheels 'coming to rest' then changing direction on film as their velocity increases.) When most of the other visual cues are lost due to fog your brain is pretty much wholy dependent on the OHL posts, and bases its' motion estimate on the artefact of the sampling timebase and velocity product.
QUOTE (dwb @ 15 Dec 2008, 23:14) <{POST_SNAPBACK}>Did you get an impression of going backwards in some of the foggy bits?
Your visual system gets conflicting evidence due to the fixed timebase video sampling of the image and the varying speed of the train. The most regular part of the view is the OHL posts, and the sampling rate / train speed combination determines whether these are perceived as advancing or retreating. (Same effect as spoked wheels 'coming to rest' then changing direction on film as their velocity increases.) When most of the other visual cues are lost due to fog your brain is pretty much wholy dependent on the OHL posts, and bases its' motion estimate on the artefact of the sampling timebase and velocity product.