diff --git a/src/clients/PisClientV2.ts b/src/clients/PisClientV2.ts
index 17bd010..54c429a 100644
--- a/src/clients/PisClientV2.ts
+++ b/src/clients/PisClientV2.ts
@@ -1,5 +1,6 @@
 import { BaseOwlBoardClient } from "./client";
-import { ValidationError } from "../errors";
+import { PisV2_Long, PisV2_Short } from "../types/pis/PisTypesV2";
+import { validateCrs, validatePisCode, validateTiploc } from "../inputValidation/inputValidation";
 
 export class PisClientV2 {
     private client: BaseOwlBoardClient;
@@ -8,12 +9,26 @@ export class PisClientV2 {
         this.client = client;
     }
 
-    async getStopsByPis(code: string): Promise<any> {
-        const codeRegex = /^\d{4}$/;
-        if (!codeRegex.test(code)) {
-            throw new ValidationError("Invalid input: code must be a four-character string consisting of only numerals")
-        }
+    async getStopsByPis(code: string): Promise<PisV2_Long> {
+        validatePisCode(code);
         const path = `/api/v2/pis/byCode/${code}`
         return this.client.makeRequest("GET", path);
     }
+
+    //* >> This feature is not currently exposed by the API << //
+    async getPisByTiplocList(tiploc_list: string[]): Promise<PisV2_Short> {
+        for (const tiploc in tiploc_list) {
+            validateTiploc(tiploc);
+        }
+        const path = `/api/v2/pis/byTiplocList/${tiploc_list}`
+        return this.client.makeRequest("GET", path);
+    }
+    //*/
+
+    async getPisByStartEndCRS(startCrs: string, endCrs: string): Promise<PisV2_Short> {
+        validateCrs(startCrs);
+        validateCrs(endCrs);
+        const path = `/api/v2/pis/byStartEnd/${startCrs}/${endCrs}`
+        return this.client.makeRequest("GET", path);
+    }
 }
\ No newline at end of file
diff --git a/src/inputValidation/inputValidation.ts b/src/inputValidation/inputValidation.ts
new file mode 100644
index 0000000..5577f63
--- /dev/null
+++ b/src/inputValidation/inputValidation.ts
@@ -0,0 +1,25 @@
+import { ValidationError } from "../errors";
+
+export function validatePisCode(code: string): boolean {
+    const codeRegex = /^\d{4}$/;
+    if (!codeRegex.test(code)) {
+        throw new ValidationError("Invalid input: code must be a four-character string consisting of only numerals");
+    }
+    return true;
+}
+
+export function validateTiploc(tiploc: string): boolean {
+    const tiplocRegex = /[a-zA-z0-9]{4,7}/;
+    if (!tiplocRegex.test(tiploc)) {
+        throw new ValidationError("Invalid input: TIPLOC must be between four and seven characters");
+    }
+    return true;
+}
+
+export function validateCrs(crs: string): boolean {
+    const crsRegex = /[a-zA-z]{3}/;
+    if (!crsRegex.test(crs)) {
+        throw new ValidationError("Invalid input: CRS/3ALPHA must be exactly three letters")
+    }
+    return true;
+}
\ No newline at end of file
diff --git a/src/types/README.md b/src/types/README.md
new file mode 100644
index 0000000..045005c
--- /dev/null
+++ b/src/types/README.md
@@ -0,0 +1,5 @@
+This directory contains TS source files describing TS types which
+are returned by the OwlBoard API.
+
+Files are organised in directories, one for each category - in each directory
+there is a file for each version.
\ No newline at end of file
diff --git a/src/types/pis/PisTypesV2.ts b/src/types/pis/PisTypesV2.ts
new file mode 100644
index 0000000..9f47525
--- /dev/null
+++ b/src/types/pis/PisTypesV2.ts
@@ -0,0 +1,13 @@
+export interface PisV2_Short {
+    code: string;
+    toc: string;
+    skipCount: number;
+    skipType?: string;
+}
+
+export interface PisV2_Long {
+    code: string;
+    stops: string[];
+    toc: string;
+    tiplocs?: string;
+}
\ No newline at end of file