Wessex Dec 2020 timetable simulations (UK)

The South Western Railway (SWR) mainline to Weymouth connects London Waterloo station to the south-west of England. SWR provides suburban services in the counties of Surrey, Hampshire and Dorset, as well as regional services in Devon, Somerset, Berkshire and Wiltshire. The eight tracks entering London Waterloo are subdivided into two double track main lines (fast and slow lines) with the remaining four single-track lines serving suburban services (Windsor lines). During peak hours up to 24 trains per hour travel on the fast line in each direction. Despite the high density of block sections, the high number of trains per hour increases the probability of delays that can quickly propagate in the wider network.

In this study trenolab evaluated the performances of future timetable drafts for the London area (May 2020 and December 2020 timetables). The modelling work at the Clapham Junction station considered also the effects of different approach controls on the Main Fast Line. The approach control is a signalling function used to slow down trains approaching a switch area by showing a restrictive aspect. Trenissimo, with its detailed signalling models, was used to test four approach controls: MAR (Main route aspect release from Red), MAY (Main route aspect release from Yellow), MAYY (Main route aspect release from double Yellow) and MAF (Main route aspect free) in combination with a speed restriction approaching the station.