fix issue and add consolidation

apps/edr-freight-api/src/modules/train-scheduling/booking-batch.service.ts

@@ -2831,7 +2831,6 @@ export class BookingBatchService implements OnModuleInit {
     wagonTypeIds: string[] = [],
   ): Promise<boolean> {
     if (!this.isSplitEligible(booking, isPair)) return false;
-    const wagonDims = await this.loadWagonDims();
     // PER_TON bulk partials are sized on ONE concrete wagon type at the
     // cargo's per-wagon cap — sizing on the first type's raw 70T rating
     // offered tonnage the wagons could never carry (Perishable caps at
@@ -2846,6 +2845,7 @@ export class BookingBatchService implements OnModuleInit {
       booking.freightType === "BULK" &&
       !perItemBulk &&
       wagonTypeIds.length > 0;
+    const wagonDims = cappedBulk ? await this.loadWagonDims() : null;
     const target = candidates
       .map((c) => {
         const leg = c.budget.legOf(booking.originYardId, booking.destinationYardId);
@@ -2856,7 +2856,7 @@ export class BookingBatchService implements OnModuleInit {
         // them NW5" into an offer for 16 — the customer pays for 16 and the
         // other 4 leave as the usual remainder booking, instead of paying for
         // 20 and stalling at allocation on wagon 17.
-        if (cappedBulk) {
+        if (cappedBulk && wagonDims) {
           const best = this.allowedDimsWithTypes(booking, wagonDims)
             .filter((o): o is { wagonTypeId: string; dims: PerWagonDims } =>
               o.wagonTypeId != null,