diff --git a/src/utils/translators/ldb/staffStation.ts b/src/utils/translators/ldb/staffStation.ts
index c30513b..6f217fb 100644
--- a/src/utils/translators/ldb/staffStation.ts
+++ b/src/utils/translators/ldb/staffStation.ts
@@ -104,15 +104,15 @@ function transformLocation(input: any): ServiceLocation[] {
   return output
 }
 
-function calculateLength(input: TrainServices): number | undefined {
+export function calculateLength(input: any): number | undefined {
   let length: number;
   if (input?.length) {
     length = input.length
-    return length
+    return Number(length)
   }
   if (input?.formation?.coaches?.coach) {
     length = input.formation.coaches.coach.length
-    return length
+    return Number(length)
   }
   return undefined
 }
diff --git a/test/utils/translators/ldb/staffStation.utils.test.ts b/test/utils/translators/ldb/staffStation.utils.test.ts
index 4f839f6..357645b 100644
--- a/test/utils/translators/ldb/staffStation.utils.test.ts
+++ b/test/utils/translators/ldb/staffStation.utils.test.ts
@@ -1,7 +1,12 @@
-import { transform } from "../../../../src/utils/translators/ldb/staffStation";
+import { 
+  transform, 
+  calculateLength
+ } from "../../../../src/utils/translators/ldb/staffStation";
 
 import { inputs } from "./stationInputs";
 import { outputs } from "./stationOutputs";
+import { noLength as serviceNoLength } from "./trainServiceInputs";
+import { trainServices } from "./trainServiceInputs";
 
 describe('transform', () => {
   test('Should return null for empty input', () => {
@@ -10,7 +15,7 @@ describe('transform', () => {
   });
 
   for (const testNo in inputs) {
-    test(`Should correctly transform data ${testNo + 1}`, () => {
+    test(`Should correctly transform data ${testNo}`, () => {
       const input = inputs[testNo]
       const expectedOutput = outputs[testNo]
 
@@ -20,4 +25,21 @@ describe('transform', () => {
   }
 });
 
-// Write test for calculateLength(input: TrainServices): number | undefined
\ No newline at end of file
+// Write test for calculateLength(input: TrainServices): number | undefined
+
+describe('calculateLength', () => {
+  test('Should return ubdefined for no length', () => {
+    const input = serviceNoLength;
+    expect(calculateLength(input)).toBeUndefined();
+  });
+
+  for (const testNo in trainServices) {
+    test(`Should correctly calculate ${testNo}`, () => {
+      const input = trainServices[testNo]
+      const expectedOutput = 4
+
+      expect(calculateLength(input)).toEqual(expectedOutput);
+    
+    });
+  }
+});
\ No newline at end of file
diff --git a/test/utils/translators/ldb/trainServiceInputs.ts b/test/utils/translators/ldb/trainServiceInputs.ts
new file mode 100644
index 0000000..11bd4ba
--- /dev/null
+++ b/test/utils/translators/ldb/trainServiceInputs.ts
@@ -0,0 +1,41 @@
+import type { TrainServices } from "@owlboard/ts-types";
+
+export const noLength: any = {
+  "rid": "202308058004480",
+  "uid": "P04480",
+  "trainid": "1A39",
+  "sdd": "2023-08-05",
+  "operator": "Great Western Railway",
+  "operatorCode": "GW",
+  "sta": "2023-08-05T21:51:00",
+  "eta": "2023-08-05T23:04:18",
+  "arrivalType": "Forecast",
+  "std": "2023-08-05T22:00:00",
+  "etd": "2023-08-05T23:05:18",
+  "departureType": "Forecast",
+  "departureSource": "Darwin",
+  "platform": "7",
+  "origin": {
+      "location": {
+          "locationName": "Penzance",
+          "crs": "PNZ",
+          "tiploc": "PENZNCE"
+      }
+  },
+  "destination": {
+      "location": {
+          "locationName": "London Paddington",
+          "crs": "PAD",
+          "tiploc": "PADTON"
+      }
+  },
+  "delayReason": "887",
+  "category": "XX",
+  "activities": "T"
+}
+
+export const trainServices: any[] = [
+  {"rid":"202308058005927","uid":"P05927","trainid":"2T53","sdd":"2023-08-05","operator":"Great Western Railway","operatorCode":"GW","sta":"2023-08-05T19:52:00","eta":"2023-08-05T19:52:00","arrivalType":"Forecast","std":"2023-08-05T19:56:00","etd":"2023-08-05T19:56:00","departureType":"Forecast","departureSource":"Darwin","platform":"2","formation":{"coaches":{"coach":[{"coachClass":"Standard"},{"coachClass":"Standard"},{"coachClass":"Standard"},{"coachClass":"Standard"}]}},"origin":{"location":{"locationName":"Worcester Foregate Street","crs":"WOF","tiploc":"WORCSFS"}},"destination":{"location":{"locationName":"Bristol Temple Meads","crs":"BRI","tiploc":"BRSTLTM","via":"via Gloucester"}},"category":"OO","activities":"T"},
+  {"rid":"202308057126314","uid":"G26314","trainid":"2V88","sdd":"2023-08-05","operator":"West Midlands Trains","operatorCode":"LM","sta":"2023-08-05T18:28:00","eta":"2023-08-05T18:28:00","arrivalType":"Forecast","std":"2023-08-05T18:33:00","etd":"2023-08-05T18:33:00","departureType":"Forecast","departureSource":"Darwin","platform":"2","formation":{"coaches":{"coach":[{"coachClass":"Standard"},{"coachClass":"Standard","toilet":"Accessible"},{"coachClass":"Standard"},{"coachClass":"Standard","toilet":"Accessible"}]}},"origin":{"location":{"locationName":"Dorridge","crs":"DDG","tiploc":"DORIDGE"}},"destination":{"location":{"locationName":"Worcester Foregate Street","crs":"WOF","tiploc":"WORCSFS"}},"category":"OO","activities":"T RM","length":"4"},
+  {"rid":"202308057126318","uid":"G26318","trainid":"2V96","sdd":"2023-08-05","operator":"West Midlands Trains","operatorCode":"LM","sta":"2023-08-05T19:28:00","eta":"2023-08-05T19:28:00","arrivalType":"Forecast","std":"2023-08-05T19:33:00","etd":"2023-08-05T19:33:00","departureType":"Forecast","departureSource":"Darwin","platform":"2","origin":{"location":{"locationName":"Dorridge","crs":"DDG","tiploc":"DORIDGE"}},"destination":{"location":{"locationName":"Worcester Foregate Street","crs":"WOF","tiploc":"WORCSFS"}},"category":"OO","activities":"T RM","length":"4"}
+]
\ No newline at end of file