A color-line at stations 281 and 283 — the party's hop point onto the Nightmare Express.
The Mauve Line is a color-coded route the party uses as a routing link in Katia-Grim's optimized path to the mysterious stop 436. After riding the Dismemberment-Limited to transfer station 281 (where the Mauve and Puce lines meet), they plan to take the Mauve two stops up to 283 — where it and the Purple line meet the Nightmare-Express. Katia's mastery of the tangled map turns a 20-hour purple-line slog into a couple of hours of hops across named and colored lines.
A mauve-coded route on the Iron Tangle's subway maps.
A connector line on the party's fast route to the Nightmare Express and stop 436.