A foray into coupled project choices
Platforms, signalling and power have to work together. So do the choices that get them built. Explore the railway, the programme and the path between them.
Featured experiment · keep service running through the upgrade
Co-design keeps the requirements and resource trade-offs of connected systems in the same decision.
ONE INVESTIGATIONStart with the question you have
Begin with a delivery path, size the power that enables it, compare programme assumptions, or explore a wildlife crossing. Each essay has its own declared model.
Require continued service, shared crews, restricted access or an intermediate milestone. Find feasible action sequences and inspect every step behind the resource trade-offs.
Staged path co-design. Exact finite construction with independently checked witnesses.
Battery racks bring cooling allowances. Cooling needs electricity, and conversion loses some as heat. Follow those requirements around the loop until a complete installation emerges.
New · Temporary power co-design. Recorded Python MCDP calculations, with independently checked whole-unit implementations.
Compare compatible packages, governance assumptions and four supplied staging strategies. See how interface mismatch and an illustrative approvals loop affect the alternatives.
Programme co-design studio. A broader comparison, with an introductory explanation of coupled requirements.
A bridge is one part of the answer. Compose bridge, fencing and monitoring choices; inspect the complete alternatives and the trade-offs they leave between resources.
Wildlife-crossing co-design. A finite component model with explicit interfaces and implementation witnesses.
How the parts fit
Specify what the system must provide. Keep combinations whose parts satisfy each other’s requirements. Then compare the resources those complete implementations need.
The rail path, temporary-power, programme and wildlife models use this common structure at different levels. Their method notes show the actual interfaces and the limits of the construction.
Read the categorical co-design audit ↗Ideas you can inspect
These experiments draw on monotone co-design: represent what connected parts must provide, then retain the resource choices that remain incomparable. The method notes connect the actual constructions to Zardini and Censi, and distinguish model assumptions from checked results.
All are illustrative project models. Their different assumptions belong to each experiment; their results are not interchangeable forecasts.