A nonempty regular transport route

Choose a straight developed spatial segment of length $\ell >0$ in the inherited regular convex tube. After readout, lookup, and a positive processing buffer, depart at developed time $t_{\mathrm{d}}$. Choose $n\ge 1$ and stations

Every station has a $p$-qubit payload register $A_j$, and the registers $A_1,\dots ,A_n$ begin in independent blank states $\omega$. At hop $j$, SWAP $A_{j-1}$ with $A_j$, with developed tick duration $\ell /n$.

The two-register tick-boundary SWAP is a declared finite operational permission, not a derived microscopic interaction Hamiltonian. Cross-port dependencies are null, and same-station dependencies are timelike. Classical report wires have separate causal certificates.