Engineer__TOC__Engineer's Line References are three letter codes for identifying individual routes on the UK rail network. Any bridge, or other structure, can be identified and located by its unique ELR and distance from the main terminus. Many of the codes remained unchanged from pre grouping, right through nationalisation to the present day.<br>
Those ELRs relevant to the present Severn Valley Railway, including the Loop and the Tenbury Branch are:{| class="wikitable"|-! ELR !! Original Severn Valley Railway !! Present day SVR are;!! Mileages on www.railwaycodes.og.uk |-| OWW (Oxford, Worcester & Wolverhampton) || Worcester/[[Hartlebury]] - Hartlebury Junction <br> [[Kidderminster Junction signal box | Kidderminster Junction]] - [[Kidderminster]] || Kidderminster Junction – Kidderminster ||[http://www.railwaycodes.org.uk/ELRs/_mileages/O/OWW.txt Mileages]|-*|SVB (Severn Valley Branch) || Hartlebury Junction - [[Sutton Bridge Junction]] || Bewdley South Junction – [[Bridgnorth]]<br>[[Stourport Branch]] (not used) ||[http://www.railwaycodes.org.uk/ELRs/_mileages/S/SVB.txt Mileages on ]|-|BYK (Bewdley & Kidderminster) || Kidderminster Junction - Bewdley South Junction || Kidderminster Junction - Bewdley South Junction ||[http://www.railwaycodes.org.uk/ELRs/_mileages/B/BYK.txt Mileages]*|-|TBY (Tenbury & Bewdley) - || Bewdley North Junction – Tenbury junction with WTW || [[Tenbury Branch]] siding ||[http://www.railwaycodes.org.uk/ELRs/_mileages/T/TBY.txt Mileages on www.railwaycodes.org.uk]*OWW (Oxford, Worcester & Wolverhampton) |- | WTW Wooferton and Tenbury Wells Branch || Tenbury Junction with TBY – Woofferton Junction || N/A || [http://www.railwaycodes.org.uk/ELRs/_mileages/OW/OWWWTW.txt Mileages on www.railwaycodes.org.uk]*BYK |-|SHL (Bewdley & KidderminsterShrewsbury and Hereford Line) || Sutton Bridge Junction – Shrewsbury<br>Wooferton Junction - Woofferton || N/A || [http://www.railwaycodes.org.uk/ELRs/_mileages/BS/BYKSHL.txt Mileages on www.railwaycodes.org.uk]|-|}
References to "Severn Valley Branch"<ref>[http://maps.nls.uk/geo/explore/#zoom=16&lat=52.3984&lon=-2.3311&layers=171 SVB on OS map on National Library of Scotland web site]</ref>, "Tenbury & Bewdley Branch"<ref>[http://maps.nls.uk/geo/explore/#zoom=16&lat=52.3845&lon=-2.3710&layers=171 TBY on OS map on National Library of Scotland web site]</ref> and "Oxford, Worcester & Wolverhampton"<ref>[http://maps.nls.uk/geo/explore/#zoom=16&lat=52.3649&lon=-2.2399&layers=171 OWW on OS map on National Library of Scotland web site]</ref> can all be seen on the 1905 Ordnance Survey maps. BYK was referred to as the "Loop Line"<ref> [http://maps.nls.uk/geo/explore/#zoom=16&lat=52.3695&lon=-2.2827&layers=171 Loop Line on OS map on National Library of Scotland web site]</ref>
