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In page Bristol and Exeter Railway:

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The rival London and South Western Railway (LSWR) had its main line from London to Southampton, and was planning to extend to Exeter. The GWR wished to prevent this by promoting its own lines in the region. At this period Parliament considered that only one line was appropriate to serve any particular area, and naturally each company wished their own allies' lines to be authorised. The LSWR was a narrow gauge railway (later referred to as standard gauge) and the GWR and B&ER were broad gauge lines; the intense rivalry to secure territory was referred to as the gauge wars.