Re: [CBQ] Distances

["John D. Mitchell, Jr." <cbqrr47@yahoo.com>]

Mile post locations are indeed decimal locations to the nearest hundredth of a foot. The usual but not always 0.00 point was the point of the switch on the sub-division, spur or branch, but sometimes it was at the starting terminal station of the sub-division. Over time the actual distances on the line would many vary from the MP locations because of line chances. On alignment charts there are, sometimes, what surveyors call "station equations". For examble, MP 122.56= MP123.14, meaning the line has been shortened here. It can also lengthen when a curve is straightened.

--- On Sun, 3/24/13, Rupert & Maureen <gamlenz@ihug.co.nz> wrote:

From: Rupert & Maureen <gamlenz@ihug.co.nz>
Subject: [CBQ] Distances
To: "CBQ List" <CBQ@yahoogroups.com>
Date: Sunday, March 24, 2013, 9:15 PM

 

Milepost distances and track chart notations were shown with two decimal places such as M.P. 123.45.  
If you were using the metric system (kilometres) that’s easy to calculate with 1000 metres to the kilometre and tape measures marked accordingly, so 0.01 km equals 10 metres. With imperial measurements, 0.01 of a mile equals 17.6 yards (17 yards 1 foot and 9.6 inches, or 52.8 feet) – a bit hard to measure.

Was the M.P. value a genuine decimal figure? If so, how was it physically measured?

Rupert Gamlen
Auckland NZ

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