8. Calvert Infrastructure Maintenance Depot
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HS2 London – West Midlands Design Refinement Consultation 8. Calvert Infrastructure Maintenance Depot Proposed change The Secretary of State is minded to provide an additional east-south ‘chord’ - a short, curved connecting rail line - to improve access from the proposed Calvert Infrastructure Maintenance Depot to HS2 tracks to the south. 8.1 Summary of January 2012 proposal 8.1.1 The January 2012 route included access to the HS2 mainline from the Calvert Infrastructure Maintenance Depot (IMD) via a link line to the north of the depot. 8.1.2 At this location HS2 crosses the Bicester-Bletchley line, which is currently a lightly used single track freight railway. The IMD is just to the north east of the crossing point. There is also an east-to-south railway chord serving the Calvert waste transfer facility and connecting the Bicester-Bletchley line to the line to Aylesbury which runs south from Calvert alongside the proposed HS2 track. 8.1.3 In January 2013, the Government announced its support for the East West Rail (EWR) project to upgrade and electrify these railway lines to provide services from Bedford to Oxford and beyond as well as onto the Aylesbury Link. The EWR services turning south to Aylesbury will require a new east-south chord, because the lines to Aylesbury will be shifted slightly eastwards to accommodate the new HS2 lines. 8.2 Issues identified with the January 2012 proposal 8.2.1 The developed January 2012 proposal envisages that trains from the IMD heading south would reverse northwards into sidings near Twyford before continuing south on HS2 tracks. However this solution makes accessing the southern part of the route from the depot relatively slow and could unnecessarily disturb residents of Twyford. This arrangement would cause more maintenance trains to pass Twyford than is necessary and such trains would mainly be leaving the depot in the late evening and returning in the early morning. 40 Figure 8 Calvert Infrastructure Maintenance Depot 0 0.25 0.5 0.75 1 I Kilometres Infrastructure Maintenance Depot ! !! ! ! ! ! ! ! Proposed new ! chord for EWR ! Aylesbury services HS2 ! Proposed MaintenanceDepot 8. CalvertInfrastructure ! new chord for depot Figure 8: Calvert Infrastructure Maintenance Depot Legend: January 2012 Route Proposed Access Chord to Maintenance Depot !( !( Proposed East West Rail (EWR) !(!(!( alignment !( " ! ! Proposed new chord for EWR Aylesbury services !( !( !( !( 41 Existing Bicester-Bletchley railway © Crown copyright and database right 2013. Ordnance Survey Licence Number 100049190. HS2-HS2-GI-MAP-000-000033 HS2 London – West Midlands Design Refinement Consultation 8.3 Design options 8.3.1 The option investigated was the construction of a new HS2 east-south chord to enable trains from the Calvert Infrastructure Maintenance Depot (IMD) to directly access the southbound HS2 tracks. The HS2 southbound link would be located close to the new EWR chord. This would avoid the need for all maintenance trains going to and from the south to reverse near to Twyford and would avoid the noise and visual impacts that such train movements could generate. (See Fig. 8.) 8.3.2 The new chord would also facilitate construction of the railway as the depot site is proposed to be a construction worksite and an east-south chord would assist the movement by rail of material and equipment. 8.3.3 Whilst the precise alignment of the two east-south chords is not yet certain, the HS2 chord to the depot would not be expected to have any significant environmental impacts. (The new EWR chord is likely to be close to the Grade II listed Sheep’s Furze Farm and may therefore involve demolition of some or all of the buildings.) 8.4 Why the Secretary of State is minded to make the change 8.4.1 The introduction of an east-south chord for HS2 allowing direct access to the depot from the south would significantly improve the operation and resilience of the railway. There would also be less disturbance at night for Twyford residents if maintenance trains do not have to undertake a reversing manoeuvre. 8.5 Question 8.5.1 This proposed change consists of an additional chord to give direct access between the proposed Calvert Infrastructure Maintenance Depot and HS2 tracks to the south. Please give your views on this proposal, indicating whether or not you support the proposal together with your reasons. 42 9. Maintenance Loop near Wormleighton 9. Maintenance Loop near Wormleighton Proposed change To support efficient operation of the railway, the Secretary of State is minded to locate a maintenance loop near Wormleighton in Warwickshire. 9.1 Summary of January 2012 proposal 9.1.1 The route announced in January 2012 included an Infrastructure Maintenance Depot (IMD) for the high speed route at Calvert, about half way along the route. (See Fig. 9.) This site is the base for maintenance of all elements of the static railway including track, signalling and overhead power equipment, cuttings and embankments. 9.2 Issues identified with the January 2012 proposal 9.2.1 Since the January 2012 proposals were announced, HS2 Ltd has developed a maintenance strategy for the railway to enable the infrastructure to reliably support the proposed train service. The frequency of the train service limits the opportunity to undertake maintenance, which must thus take place during the night closure period or in limited periods at the beginning and end of the day when the service is less frequent. To maximise the amount of work undertaken within the night shift, maintenance trains need to arrive quickly at their work sites. As a result HS2 Ltd has recommended a maintenance loop be located near Wormleighton, approximately half way between the maintenance depot at Calvert and Birmingham, and also one at Stoke Mandeville in Buckinghamshire, approximately half way between Calvert and Euston. (See Chapter 7.) 9.2.2 The principal function of the loops is to allow maintenance trains to be kept securely during the day in readiness for maintenance work during the night. The trains can then reach the location for their maintenance works quickly and so optimise the maintenance approach for the railway. A second function is as a safe stopping location for any passenger train that develops a fault. 43 HS2 London – West Midlands Design Refinement Consultation 9.2.3 The maintenance loop sites need to be largely flat, straight and located next to a straight section of the main line with sufficient space for connections to both sides as well as good road access. The length of the loop line needs to be approximately 1.25km long to allow a train to be parked clear of the line if necessary. The track corridor width at maintenance loops will be about 16 metres wider than the two track section to allow for the additional loop line on either side. During the night when is use, the site would be lit by low level lighting. 9.3 Design options 9.3.1 When looking for a suitable site for the maintenance loop, HS2 Ltd required sites that were straight, broadly flat and roughly halfway between Calvert and Birmingham. 9.3.2 The undulating landscape and the curvature of the route between Calvert and Birmingham limit the number of sites that can support the maintenance requirements. Three straight sections were identified as potential locations, all in rural areas: • Lower Radbourne; • Wormleighton (the proposed scheme); and • Greatworth. Lower Radbourne 9.3.3 This location would require the route and maintenance loops to be placed on viaducts or on embankment up to 14 metres high, raising the proposed route by 7 metres. Long access roads would be required to connect the site to the nearest suitable highway network. This location would be highly visible from the surrounding area and affect the setting of Hodnell Manor, a Scheduled Monument, fishing ponds and some listed buildings in Wormleighton. As the loops would be positioned higher than the natural landscape there would be increased likelihood of noise intrusion during construction and operation. Wormleighton 9.3.4 The preferred location near Wormleighton could be contained within a section of deep cutting, reducing the visual, landscape and noise impact on the local community compared to the Lower Radbourne location. The site would be visible to users of nearby local roads and public rights of way. 44 Figure 9 Wormleighton Maintenance Loop 0 0.25 0.5 0.75 1 I Kilometres Highway access point Maintenance loop parallel to track Maintenance loop parallel to track 9. MaintenanceLoopnearWormleighton Figure 9: Maintenance Loop near Wormleighton !( !( Legend: !(!(!( " January 2012 Route !( Proposed Change !( !( !( !( 45 Railway cutting © Crown copyright and database right 2013. Ordnance Survey Licence Number 100049190. HS2-HS2-GI-MAP-000-000034 HS2 London – West Midlands Design Refinement Consultation Greatworth 9.3.5 At a distance of 20km from Calvert this location was assessed as too close to Calvert to be operationally desirable. This location would mean that maintenance trains would take too long to travel up towards sites nearer Birmingham leaving them little time to carry out any maintenance that might be needed. 9.4 Why the Secretary of State is minded to make this change 9.4.1 The Secretary of State is minded to locate a necessary maintenance loop near Wormleighton in Warwickshire as this location is the most operationally efficient and has the least impact on the local environment of the viable options. 9.5 Question 9.5.1 This proposed change consists of providing a maintenance loop near Wormleighton in Warwickshire to support the efficient operation of the railway. Please give your views on this proposal, indicating whether or not you support the proposal together with your reasons. 46 10.