diff --git a/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts b/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts
index ffcf936bd..cb9cc8ae1 100644
--- a/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts
+++ b/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts
@@ -1516,6 +1516,7 @@ export class BookingBatchService implements OnModuleInit {
             stock,
             leg,
             this.scarcityRankForPool([primary], allowedWagonTypes),
+            wagonTypeIds,
           )
         : null;
       const seated = useSmart
@@ -2357,7 +2358,7 @@ export class BookingBatchService implements OnModuleInit {
         !perItemBulk &&
         wagonTypeIds.length > 0;
       const smart = useSmart
-        ? this.smartBulkNeed(booking, wagonDims, stock, leg, scarcityRank)
+        ? this.smartBulkNeed(booking, wagonDims, stock, leg, scarcityRank, wagonTypeIds)
         : null;
       const admitted = useSmart
         ? smart != null && budget.fits(smart.need, leg)
@@ -2653,7 +2654,14 @@ export class BookingBatchService implements OnModuleInit {
         const leg = legOn(t);
         if (leg == null) continue;
         if (useSmart) {
-          const probe = this.smartBulkNeed(booking, wagonDims, t.stock, leg, scarcityRank);
+          const probe = this.smartBulkNeed(
+            booking,
+            wagonDims,
+            t.stock,
+            leg,
+            scarcityRank,
+            wagonTypeIds,
+          );
           if (probe != null && t.budget.fits(probe.need, leg)) {
             smart = probe;
             target = t;
@@ -2858,10 +2866,14 @@ export class BookingBatchService implements OnModuleInit {
         // other 4 leave as the usual remainder booking, instead of paying for
         // 20 and stalling at allocation on wagon 17.
         if (cappedBulk && wagonDims) {
-          const best = this.allowedDimsWithTypes(booking, wagonDims)
-            .filter((o): o is { wagonTypeId: string; dims: PerWagonDims } =>
-              o.wagonTypeId != null,
-            )
+          // Types resolved from the id list (join tables), never the pool
+          // entity's unloaded cargoType.wagonTypes relation — see smartBulkNeed.
+          const best = [...new Set(wagonTypeIds)]
+            .map((wagonTypeId) => ({
+              wagonTypeId,
+              dims: wagonDims.byWagonTypeId.get(wagonTypeId),
+            }))
+            .filter((o): o is { wagonTypeId: string; dims: PerWagonDims } => o.dims != null)
             .map((o) => ({
               ...o,
               free: c.stock?.availableFor([o.wagonTypeId], leg) ?? 0,
@@ -5074,7 +5086,7 @@ export class BookingBatchService implements OnModuleInit {
         Number(b.bulkTotalWeightTons ?? 0) > 0 &&
         Number(b.cargoTotalWeightVgm ?? 0) > 0;
       if (b.freightType === "BULK" && !perItemBulk && typeIds.length) {
-        const smart = this.smartBulkNeed(b, wagonDims, ledger, leg, rank);
+        const smart = this.smartBulkNeed(b, wagonDims, ledger, leg, rank, typeIds);
         if (smart) {
           for (const part of smart.perType) {
             ledger.consume([part.wagonTypeId], part.wagons, leg);
@@ -5168,9 +5180,19 @@ export class BookingBatchService implements OnModuleInit {
     stock: WagonStockLedger,
     leg: CorridorLeg,
     scarcityRank: Map<string, number>,
+    /**
+     * Wagon-type ids this booking may ride, from {@link loadAllowedWagonTypeIds}
+     * — NEVER from `booking.cargoType.wagonTypes`. The batch pool finders
+     * deliberately do not join that relation (hot path), so on a pool entity
+     * it is always empty; resolving through it made every PER_TON bulk booking
+     * unseatable — no whole fit and no partial offer, silently READY forever
+     * (the S-2026-00020 / BK-2026-000036 incident).
+     */
+    wagonTypeIds: readonly string[],
   ): { need: Capacity; perType: Array<{ wagonTypeId: string; wagons: number }> } | null {
-    const options = this.allowedDimsWithTypes(booking, wagonDims)
-      .filter((o): o is { wagonTypeId: string; dims: PerWagonDims } => o.wagonTypeId != null)
+    const options = [...new Set(wagonTypeIds)]
+      .map((wagonTypeId) => ({ wagonTypeId, dims: wagonDims.byWagonTypeId.get(wagonTypeId) }))
+      .filter((o): o is { wagonTypeId: string; dims: PerWagonDims } => o.dims != null)
       .map((o) => ({
         ...o,
         free: stock.availableFor([o.wagonTypeId], leg),
diff --git a/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.smart-need.spec.ts b/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.smart-need.spec.ts
index 922ec2335..dd7797d33 100644
--- a/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.smart-need.spec.ts
+++ b/apps/edr-freight-api/src/modules/train-scheduling/booking-batch.smart-need.spec.ts
@@ -22,17 +22,21 @@ describe('BookingBatchService.smartBulkNeed', () => {
           s: WagonStockLedger,
           l: { fromEdge: number; toEdge: number },
           r: Map<string, number>,
+          ids: readonly string[],
         ) => { need: { wagons: number }; perType: Array<{ wagonTypeId: string; wagons: number }> } | null;
       }
-    ).smartBulkNeed(booking, wagonDims, stock, { fromEdge: 0, toEdge: 1 }, rank);
+    ).smartBulkNeed(booking, wagonDims, stock, { fromEdge: 0, toEdge: 1 }, rank, allowedIds);
 
   const nw5 = { id: 'wt-nw5', capacityTons: 70 };
   const pw2 = { id: 'wt-pw2', capacityTons: 70 };
+  // Shaped like a BATCH POOL entity: cargoType WITHOUT the wagonTypes
+  // relation (the pool query never joins it) — allowed types must come from
+  // the ids parameter, or every pool bulk booking reads as unseatable.
   const perishable = {
     id: 'cargo-perishable',
-    wagonTypes: [nw5, pw2],
     tonsPerWagonMap: { [nw5.id]: 30, [pw2.id]: 20 },
   };
+  const allowedIds = [nw5.id, pw2.id];
   const wagonDims = {
     container: { lengthMeters: 14, tareWeightTons: 24, capacityTons: 70 },
     bulk: { lengthMeters: 14, tareWeightTons: 24, capacityTons: 70 },
@@ -113,9 +117,10 @@ describe('BookingBatchService.smartBulkNeed', () => {
           s: WagonStockLedger,
           l: { fromEdge: number; toEdge: number },
           r: Map<string, number>,
+          ids: readonly string[],
         ) => { need: { wagons: number }; perType: Array<{ wagonTypeId: string; wagons: number }> } | null;
       }
-    ).smartBulkNeed(booking(200), wagonDims, stock, { fromEdge: 0, toEdge: 2 }, contested);
+    ).smartBulkNeed(booking(200), wagonDims, stock, { fromEdge: 0, toEdge: 2 }, contested, allowedIds);
     expect(smart).not.toBeNull();
     expect(smart!.perType).toEqual([{ wagonTypeId: pw2.id, wagons: 10 }]);
   });