> Posted by: "Kelvin A. White" [EMAIL PROTECTED] kelvinawhite > Date: Sun Sep 2, 2007 9:06 am ((PDT)) > > Can somebody please advise the prototype clearance heights (to the > underside of a bridge) for hi-cube boxcars and double stacks, I > want the former and want to decapitate the latter!
There is an interesting discussion of clearances at: http://www.nmra.org/standards/gauge.html The author, Roger P. Hensley, writes about the NMRA combined HO clearance & track gauge and explains that the silhouette is based on AAR Plate A, B and C clearances. He includes a 1948 Plate B diagram with an overall height of 15 feet 1 inch and an undated Plate E diagram with an overall height of 15 feet and 8 inches. He notes that the height under Plate F is an even 17 feet. As Tom Hawley wrote here Sunday, typical "Excess Height" Boxcars can be up to 17 feet and 1 inch in height, while a double-stack well car with two containers, each 9-1/2 feet high, has a height of 20 feet and 2 inches. Consequently, if you want to operate hi-cube boxcars but not double stacks, your bridge needs to be somewhere between these two figures. You probably do not want to follow the NMRA's current standard, which is 4-1/8 inch for S, or 22 feet, from the railhead to the bridge above: http://www.nmra.org/standards/s-7.html -- Bill Roberts Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
