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Gradient profile and mileages

1,690 bytes added, 14:09, 2 October 2018
metric distance markers
The profile shows the average gradient in each section (the vertical scale is exaggerated), thus on leaving Kidderminster the line initially goes downhill with a gradient of 1 in 112. ‘L’ indicates level. According to the GWR gradient profiles, the steepest gradient on both the orignal Severn Valley Railway and the Loop line did not exceed an average of 1 in 100 in any section. The horizontal scale includes the mileages (see below).
Gradient posts showing changes in gradient can be seen at the lineside. The design varies, but generally follows the principle of this prominent example near Highley stationNorthwood Halt.
<gallery>
File: Gradient_PostNorthwood gradient post.jpg | Gradient post
</gallery>
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171.59 [[File:BSicon_ABZrfBSicon_ABZrflocal.svgpng|25px]] [[Sutton Bridge Junction | Severn Valley Jct]] with SHL
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168.12 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Berrington]]
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165.43 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Cound Halt]]
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164.12 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Cressage]]
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160.23 [[File:BSicon_vSTRg+rrlocal.svgpng|25px]] To Much Wenlock
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160.23 [[File:BSicon_vBHFBSicon_vBHFlocal.svgpng|25px]] [[Buildwas]]
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160.05 [[File:BSicon_SPLeBSicon_SPLelocal.svgpng|25px]]
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160.01 [[File:BSicon_ABZlfBSicon_ABZlflocal.svgpng|25px]] Buildwas East Jct (To Madeley Jct, Wellington)
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158.68 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Ironbridge and Broseley]]
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157.55 [[File:BSicon HSTHSTlocal.svgpng|25px]] [[Jackfield Halt | Jackfield Halt 1]]
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157.37 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Jackfield Halt | Jackfield Halt 2]]
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156.68 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Coalport]]
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154.24 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Linley]]
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149.74 [[File:BSicon_BHFBSicon_BHFlocal.svgpng|25px]] [[Bridgnorth]]
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147.59 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Eardington]]
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145.33 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Hampton Loade]]
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144.07 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Country Park Halt]]
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143.61 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Alveley Halt]]
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143.20 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Highley]]
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140.74 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Arley]]
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138.77 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Northwood Halt]]
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138.22 [[File:BSicon vSTRg+rrlocal.svgpng|25px]] [[Tenbury Wall| Divergance with TBY]]
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137.39 [[File:BSicon_SPLeBSicon_SPLelocal.svgpng|25px]] [[Bewdley North signal box|Bewdley Jct North]] with TBY
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137.28 [[File:BSicon_BHFBSicon_BHFlocal.svgpng|25px]] [[Bewdley]]
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137.12 [[File:BSicon_ABZlfBSicon_ABZlflocal.svgpng|25px]] [[Bewdley South signal box|Bewdley Jct South]] with BYK
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135.19 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Burlish Halt]]
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134.54 [[File:BSicon_BHFBSicon_BHFlocal.svgpng|25px]] [[Stourport]]
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132.15 [[File:BSicon_ABZrgBSicon_ABZrglocal.svgpng|25px]] [[Hartlebury Junction | Hartlebury Jct]] with OWW
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===Bewdley to Kidderminster Curve (BYK)===
The [[Kidderminster Loop Line | Loop]] between Kidderminster and Bewdley does not lie on a direct route from London Paddington. Distances to places on the Loop as set out in the [[Engineer's Line References]] were therefore measured on the basis that you would proceed towards Kidderminster and after passing [[Kidderminster Junction signal box#Kidderminster Junction | Kidderminster Junction]] at 135 miles 9 chains, reach a reversal point 12 chains further on. Returning over the 12 chains to the Junction on the loop line (now 135 miles 33 chains), mileages are measured until Bewdley South Junction is reached at 138 miles 21 chains. However Bewdley South Junction was only 137 miles 12 chains via the direct route from Hartlebury; this lower figure becomes the base mileage for measuring distances onwards towards Bridgnorth and Tenbury. This accounts for the change in mileage at Bewdley South Junction in the profile above.
{| class="wikitable"
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135.21 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] Mileage reversal point for BYK
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135.33 [[File:BSicon_ABZlfBSicon_ABZlflocal.svgpng|25px]] [[Kidderminster Junction signal box#Kidderminster Junction | Kidderminster Jct]] for OWW
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136.32 [[File:BSicon_HSTBSicon_HSTlocal.svgpng|25px]] [[Foley Park Halt]]
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137.43 [[File:BSicon_eHSTBSicon_eHSTlocal.svgpng|25px]] [[Rifle Range Halt]]
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138.21 [[File:BSicon_ABZrfBSicon_ABZrflocal.svgpng|25px]] [[Bewdley South signal box|Bewdley Jct South]] with SVB (137.12)
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Early OS maps show the locations of mileposts on the loop line which do not accord with this method of calculation. Mileposts appear just east of Rifle Range Halt (see map below), just west of [[Stourport Road Bridge]] (the location of [[Foley Park Halt]]), and just south of Kidderminster Junction (see map below). This discrepancy could be accounted for if the earlier mileages were instead based on a reversal at Bewdley and then travelling towards Kidderminster, ie:
 
137.12 Bewdley South Junction SVB<br>
137.15 Reversal point (assumed)<br>
137.18 Bewdley South Junction BYK<br>
137.76 Rifle Range Halt (placing milepost 138 just to the east)<br>
139.07 Foley Park Halt (placing milepost 139 just to the west)<br>
140.06 Kidderminster Junction BYK (placing milepost 140 just to the south)<br>
 
<gallery>
Loop Line map.jpg|Milepost near the site of Rifle Range Halt
</gallery>
===Mileposts===
===Mileage oddities===
In addition to the 'discontinuity' in the mileage at Bewdley South Junction referred to above, the present day SVR being situated on three different ELRs gives rise to some other apparent oddities. Leaving Kidderminster, the mileage initially decreases as you pass the first milepost by the carriage shed but then increases again as you continue (due to setting off towards London but then curving away from it). Reaching Kidderminster Junction, this is two different distances from London, depending on whether you are on the OWW line or the Severn Valley Branch (due to the latter being approached by the reversal point). Finally, on Safari Park Curve you pass milepost 137&frac34;, and a short time later you enter Bewdley Station passing another milepost 137&frac34; (the former being reached via the Loop and the latter direct via Hartlebury. ===Modern distance markers===Evidence of another measurement system used for operational purposes can also be seen on the SVR. The distances have been measured from Kidderminster in kilometres, with a small marker tag attached to the web of the rail every 100 metres. The locations of these have been highlighted by white paint on the chair or sleeper adjacent to the marker. Examples can be clearly seen from the platform at Bewdley (5.700) and near the Highley cattle dock (15.100).<gallery>Bewdley_20180825.jpg|Marker at BewdleyHighley_20180825.jpg|Marker at Highley</gallery>
==See also==
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