diff --git a/apps/edr-freight-web/backoffice/src/components/ruleEngine/RuleEngineFormDialog.tsx b/apps/edr-freight-web/backoffice/src/components/ruleEngine/RuleEngineFormDialog.tsx
index 403a98f1b..8c1aed302 100644
--- a/apps/edr-freight-web/backoffice/src/components/ruleEngine/RuleEngineFormDialog.tsx
+++ b/apps/edr-freight-web/backoffice/src/components/ruleEngine/RuleEngineFormDialog.tsx
@@ -313,6 +313,7 @@ const RuleEngineFormDialog = ({
       <TextInput
         key={field.name}
         label={label}
+        description={field.description}
         type={isNumber ? "number" : field.type === "date" ? "date" : "text"}
         // Every rule-engine number (sizes, capacities, counts, points, rates,
         // display order) is a non-negative magnitude — reject negatives outright
diff --git a/apps/edr-freight-web/backoffice/src/pages/ruleEngine/config/resources.ts b/apps/edr-freight-web/backoffice/src/pages/ruleEngine/config/resources.ts
index e6a21f918..b5eb71862 100644
--- a/apps/edr-freight-web/backoffice/src/pages/ruleEngine/config/resources.ts
+++ b/apps/edr-freight-web/backoffice/src/pages/ruleEngine/config/resources.ts
@@ -279,6 +279,7 @@ export const RULE_ENGINE_RESOURCES: RuleEngineResourceConfig[] = [
       { id: "name", header: "Name", accessorKey: "name" },
       { id: "capacityTons", header: "Capacity (t)", accessorKey: "capacityTons", format: "number" },
       { id: "lengthMeters", header: "Length (m)", accessorKey: "lengthMeters", format: "number" },
+      { id: "tareWeightTons", header: "Tare (t)", accessorKey: "tareWeightTons", format: "number" },
       {
         id: "supportedLoadTypes",
         header: "Load types",
@@ -290,6 +291,15 @@ export const RULE_ENGINE_RESOURCES: RuleEngineResourceConfig[] = [
       { name: "name", label: "Name", type: "text", required: true },
       { name: "capacityTons", label: "Capacity (tons)", type: "number", required: true },
       { name: "lengthMeters", label: "Length (meters)", type: "number", required: true },
+      // The locomotive's pull limit is a GROSS limit, so capacity planning charges
+      // `cargo + wagons × tare` against it. The API rejects a create without this.
+      {
+        name: "tareWeightTons",
+        label: "Tare weight (tons)",
+        type: "number",
+        required: true,
+        description: "Empty wagon weight — counts against the locomotive's pull limit alongside the cargo",
+      },
       {
         name: "supportedLoadTypes",
         label: "Supported load types",