diff --git a/apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.ts b/apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.ts
index 0fd0546b1..2a337afef 100644
--- a/apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.ts
+++ b/apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.ts
@@ -672,7 +672,13 @@ export class TrainSchedulingService {
     return date.toISOString().slice(0, 10);
   }
 
-  private roundTons(value: number) {
-    return Number(value.toFixed(3));
+  private roundTons(value: number | string | null | undefined) {
+    const numericValue = typeof value === 'number' ? value : Number(value ?? 0);
+
+    if (!Number.isFinite(numericValue)) {
+      return 0;
+    }
+
+    return Number(numericValue.toFixed(3));
   }
 }