diff --git a/openapi.yaml b/openapi.yaml
index 922b12b..50e7ace 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -36,6 +36,7 @@ paths:
         - $ref: '#/components/parameters/language'
         - in: query
           name: lat
+          required: true
           description: Latitude
           schema:
             type: number
@@ -43,6 +44,7 @@ paths:
             example: 41.392710
         - in: query
           name: lon
+          required: true
           description: Longitude
           schema:
             type: number
@@ -55,6 +57,81 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/GetStationsResponse'
+  /trains:
+    get:
+      tags:
+        - train
+      summary: Find train connections for a specific route
+      parameters:
+        - $ref: '#/components/parameters/app'
+        - $ref: '#/components/parameters/appVersion'
+        - $ref: '#/components/parameters/osName'
+        - $ref: '#/components/parameters/osVersion'
+        - $ref: '#/components/parameters/language'
+        - in: query
+          name: outwardStation
+          required: true
+          description: Code of outward station
+          schema:
+            type: string
+            example: 60000
+        - in: query
+          name: returnStation
+          required: true
+          description: Code of return station
+          schema:
+            type: string
+            example: 71801
+        - in: query
+          name: outwardDate
+          required: true
+          description: Date for outward journey (DD-MM-YYYY)
+          schema:
+            type: string
+            format: date
+            pattern: /([0-9]{2}-[0-9]{2}-[0-9]{4}/
+            example: 01-05-2022
+        - in: query
+          name: returnDate
+          description: Date for return journey (DD-MM-YYYY)
+          schema:
+            type: string
+            format: date
+            pattern: /([0-9]{2}-[0-9]{2}-[0-9]{4}/
+            example: 02-05-2022
+        - in: query
+          name: adult
+          description: Number of adult passengers
+          schema:
+            type: number
+            format: int
+            example: 1
+        - in: query
+          name: child
+          description: Number of children
+          schema:
+            type: number
+            format: int
+        - in: query
+          name: babyUnderFour
+          description: Number of babies under 4 years
+          schema:
+            type: number
+            format: int
+        - in: query
+          name: senior
+          description: Number of senior passengers
+          schema:
+            type: number
+            format: int
+        - in: query
+          name: promoCode
+          description: Promo Code
+          schema:
+            type: string
+      responses:
+        '200':
+          description: OK
 components:
   parameters:
     app:
@@ -105,6 +182,7 @@ components:
         lastUpdateStations:
           type: string
           format: 'date-time'
+          pattern: /([0-9]{4})-(?:[0-9]{2})-([0-9]{2}) ([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3})/
           example: "2022-03-01 01:06:25.034"
     Station:
       type: object