Trying to interpret measurements from BERy track charts

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Trying to interpret measurements from BERy track charts

Postby BostonUrbEx » Tue Nov 18, 2014 4:07 pm

I'm trying to create a scale model of the lower left quadrant of this track chart:

http://www.wardmaps.com/viewasset.php?aid=9617

Anyone know how to interpret the measuring points? I'm hoping to be as accurate as possible with this, at least on the lengths. The special work and degrees of curvature might be tough.
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Re: Trying to interpret measurements from BERy track charts

Postby edbear » Tue Nov 18, 2014 6:10 pm

Go to Maverick St. B & A RR. One or end of bridge or crossing is 4+30.0 Other end is 4+70.6 Subtract smaller one and it is 40.6 ft. One end of a crossover on Maverick St. is 2+11.8 B & A RR 1st measurement is 4+30.0. Subtract smaller from the larger. 218.2 ft.
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Re: Trying to interpret measurements from BERy track charts

Postby Leo Sullivan » Tue Nov 18, 2014 6:58 pm

On the Bay State track charts there is usually only one place that is "0+0" and it is
easy to find. All measurements in that division are from that point. The El is not so clear
but, Ed has shown how to use the measurements. Note that there are no stated degrees of curvature
and the charts are not to scale. They are realistic sketches and generally representative however.
Bromley atlases are to scale but, they don't show track. They are good to use in combination.
There is no substitute for track charts for showing the situation at
a specific time (note that the track at Liverpool and Meridian is disconnected but still in).
The date of that plan is 1915. The vellum was first drawn in 1899 and corrected many times.
each correction creating a new "original". Most of the vellums lasted until the 1946 correction
when they literally wore out.
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Re: Trying to interpret measurements from BERy track charts

Postby Gerry6309 » Tue Nov 18, 2014 7:43 pm

edbear wrote:Go to Maverick St. B & A RR. One or end of bridge or crossing is 4+30.0 Other end is 4+70.6 Subtract smaller one and it is 40.6 ft. One end of a crossover on Maverick St. is 2+11.8 B & A RR 1st measurement is 4+30.0. Subtract smaller from the larger. 218.2 ft.

One word of warning - Beware of 0+00! In some cases it may not correspond to anything real on the chart. In other cases it may have been erased because a section of track was abandoned. Lastly, a section of a line with no crossings or switches may have only a overall length for each track - no lengths for specific streets.
Gerry. STM/BSRA

The next stop is Washington. Change for Forest Hills Trains on the Winter St. Platform, and Everett Trains on the Summer St. Platform. This is an Ashmont train, change for Braintree at Columbia.
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