"There was a dream..."
Thanks to the generous help from our members, sponsors, and supporters, the static mainframe structure (with frame stays fitted) for 61673 Spirit of Sandringham is complete at our engineering base, CTL Seal Ltd in Sheffield. All manufactured parts were produced by the best of British Industry.
Significant funds will now be required to maintain the next phases of the project, involving larger and more complex components to be made in Great Britain.
JOIN THE 61673 CONSTRUCTORS CLUB
The Club has been created to consolidate our fundraising efforts into a single appeal to see 61673 complete and operating on the mainline.
Contribution: £616.73 per unit
(Payable as a single sum or over 3 years via monthly installments)
Download Sign Up Form
Project Roadmap
Contributions are invited in accordance with the project programme:
- Rolling Chassis: The immediate next step.
- Motion: Cylinders, pistons, and motion assembly.
- Running Gear: Bogie, followed by boiler and firebox.
- Superstructure: Cab and smokebox.
Manufacturing drawings for horn block castings and horn stays are complete for the leading, driving, and trailing positions. These parts will be manufactured first. Also required (as funds permit) will be cannon axle boxes, roller bearings, crank axle assembly, and plain axles for the driving and trailing locations.
Technical Strategy
The technical baseline is based upon the 1935 LNER Darlington build standard. However, modern design changes will be adopted where improvements in performance, reliability, maintenance, and safety can be realized.
Proven CAD/CAM technology forms the basis of the design, using 3D models compatible with modern manufacturing processes. To satisfy Rail Safety & Standards Board (RSSB) certification requirements, an independent assessment authority has been appointed to verify design, manufacture, and safety compliance.
Planned Build Details:
- Cylinders: Fabricated cylinders are planned (design work to commence), including pistons and motion parts.
- Bogie: Will conform to the original LNER side spring design but with side bearers to evenly distribute load. It will use roller bearings and cannon axle boxes (as proven on the A1 Tornado).
- Boiler: The diagram 100A boiler and firebox is planned. We are currently evaluating materials and assembly techniques to maximize operating efficiency and reliability. Sourcing this major item in Great Britain remains our priority.
Member Benefits
On full payment of the first unit (£616.73), contributors receive:
- Transferable invitation to purchase a seat on one of the inaugural runs.
- 61673 Constructors Club badge.
- Personalised Club certificate.
- Name on the ’Roll of Honour’ (subject to consent).
- Regular updates on manufacturing progress.
- Photograph of chosen B17 locomotive.
Achievements & The Next Phase
NOW: Static Mainframe
Relocated to CTL Seal's site at Sheffield (Oct 2020). Frame stays fitted and passed.
NEXT: Rolling Chassis
Construction now in progress.
THEN: Boiler & Firebox
The final major engineering hurdle.
Charity Registration No. 1144738 | Company Registration No. 07598363