leg-aware capacity and wagon sharing

apps/edr-freight-web/backoffice/src/pages/trainScheduling/TrainScheduleV2DetailPage.tsx

@@ -1103,19 +1103,31 @@ export default function TrainScheduleV2DetailPage() {
           },
           {
             label: "Wagons / load",
-            // Gross: cargo load + the tare of every wagon in the consist — the
-            // weight the locomotive actually hauls.
-            value: `${schedule.trainSet?.wagonCount ?? displayWagonPlan.length} · ${
-              Math.round(
-                ((schedule.trainSet?.totalWeightTons ?? 0) +
-                  (schedule.trainSet?.wagons ?? []).reduce(
-                    (sum, w) => sum + (Number(w.tareWeightTons) || 0),
-                    0,
-                  )) *
-                  100,
-              ) / 100
-            }T`,
-            hint: "gross · wagon tare + cargo",
+            // Gross: cargo load + wagon tare — the weight the locomotives
+            // actually haul. Heaviest corridor edge when the server sends it;
+            // plain consist sums over-report a multi-stop train (cross-leg
+            // wagon sharing counts one physical wagon as several slots).
+            value: (() => {
+              const heaviest = schedule.trainSet?.heaviestLeg;
+              const wagonCount =
+                heaviest?.loadedWagonCount ??
+                schedule.trainSet?.wagonCount ??
+                displayWagonPlan.length;
+              const grossTons =
+                heaviest?.grossWeightTons ??
+                Math.round(
+                  ((schedule.trainSet?.totalWeightTons ?? 0) +
+                    (schedule.trainSet?.wagons ?? []).reduce(
+                      (sum, w) => sum + (Number(w.tareWeightTons) || 0),
+                      0,
+                    )) *
+                    100,
+                ) / 100;
+              return `${wagonCount} · ${grossTons}T`;
+            })(),
+            hint: schedule.trainSet?.heaviestLeg
+              ? "heaviest leg · wagon tare + cargo"
+              : "gross · wagon tare + cargo",
             icon: Weight,
           },
           {