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[quote user="RME"](BTW, the English word for the wheelrim contact area is 'tread', not 'thread' -- I'd have PMed this but H.Landwehr has PMs turned off.) [/quote] Thank you for the correct word. I think I'll have to learn how to enable PMs. [quote user="RME"]What is a 'flat-edge rail?'[/quote] Wikipedia uses this designation in the BART article. I haven't any direct Google results only descriptions in news articles. Following their description the rail isn't tilted inwards like "standard" track. The rail tread seems to be horizontal. Here a link to a Wikipedia photo: <a>https://upload.wikimedia.org/wikipedia/commons/c/cb/BART_third_rails_croppedandrotated.jpg</a> [quote user="RME"]I have not seen a diagram of Bombardier's revised tread profile, but it is likely less than Amtrak's 'standard' 1:40 taper.[/quote] Here is a photo of the new wheelset. It doesn't look like a 1:40 taper: <a href="https://www.bart.gov/sites/default/files/images/news/Photo%20Aug%2004%2C%204%2058%2049%20PM.jpg">https://www.bart.gov/sites/default/files/images/news/Photo%20Aug%2004%2C%204%2058%2049%20PM.jpg</a> Regards, Volker
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