Rail Horizontal Labels
A `%%metro line_spread: rails` section whose top-rail stations keep the default horizontal label angle instead of an angled one. Regression fixture: rail mode's deliberate top-rail label-band hug must be reflected in the section's content-hug target, not just its own layout, or the top-padding guard misreads the intended geometry as crowding (issue #1625).
Mermaid source
%%metro title: Rail section with horizontal labels%%metro line_spread: rails | calling%%metro line: a | Caller A | #2db572%%metro line: b | Caller B | #0570b0
graph LR subgraph calling [Calling] hub[Recalibrate] x[Caller A] y[Caller B] hub -->|a| x hub -->|b| y endCLI command
nf-metro render examples/topologies/rail_horizontal_labels.mmd -o rail_horizontal_labels.svg