Originally when the layout was designed I had intended to set it in 1923 (just after the grouping), however I later decided to set the layout just after the opening of the re-modelling of Hallatrow and the opening of extension of the Camerton branch around 1909 - 11.
I visited the Public Records Office (PRO) to obtain copies of Working Timetables (WTT's) and other documents. However all the sections of the WTT's are bound together and because of the fragility and condition of the pages it is not possible to get good copies of the pages.
I was then told that there were a number of WTT's published on the web and just after that a post was put on a GWR web list asking for WTT's of the branches of the GW main line in Devon in the BR period. The reply gave details of a site with copies of a number of BR(WR) working timetable plus a number of 1911 GWR WTT's. Fortunately this included sections 3, 4 and 5 (i.e. 3 being Reading, Westbury, Taunton & Weymouth, 4 being Bristol and 5 being Weston, Taunton & Exeter). The Bristol section includes both the North Somerset and East Somerset.