Train Updater

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Diagnostics;
using System.Net;

namespace Train_Updater
{
    class Program
    {

        const string TrainCodesFilepath = "traincodes.txt";
        const char Limiter = '-';
        const string DepartureTimeFind = "\"departureTime\":\"";
        const string ArrivalTimeFind = "\"arrivalTime\":\"";
        const int TimeSize = 5;

        public static List<string> GetTimes(string SourceCode, string FindingString, int TimeSize)
        {
            List<string> Times = new List<string>();            //Creates a new list to add strings to
            int Start = 0;                                      //Defines the start of the substring

            for (int x = 0; x < 5; x++)
            {
                Start = SourceCode.IndexOf(FindingString) + FindingString.Length;         //Finds the index of the first instance
                Times.Add(SourceCode.Substring(Start, TimeSize));                         //Adds this to the list of times
                SourceCode = SourceCode.Substring(Start + TimeSize);                      //Redefines the current code string to remove the old instance
            }

            return Times;
        }

        public static List<string> GetDurations(List<string> DepartureTimes, List<string> ArrivalTimes)
        {

            List<string> RList = new List<string>();        //Creates a new list to return at the end of the function

            for (int x = 0; x < DepartureTimes.Count; x++)
            {
                int CurrentDepartureTime = Convert.ToInt32(DepartureTimes[x].Split(':')[0]) * 60 +
                                          (Convert.ToInt32(DepartureTimes[x].Split(':')[1]));               //Converts the departure and arrival times into minutes from strings
                int CurrentArrivalTime = Convert.ToInt32(ArrivalTimes[x].Split(':')[0]) * 60 +
                                        (Convert.ToInt32(ArrivalTimes[x].Split(':')[1]));

                int TimeTaken = CurrentArrivalTime - CurrentDepartureTime;                  //Works out the difference in times between the two

                if (TimeTaken < 60)
                {
                    RList.Add(Convert.ToString(TimeTaken) + " min");
                }
                else
                {
                    int Hours = TimeTaken / 60;
                    int Remaining = TimeTaken - (Hours * 60);

                    RList.Add(Convert.ToString(Hours) + " h " + Convert.ToString(Remaining) + " min");
                }
            }

            return RList;

        }

        public static string CreateUrl(string StartCode, string EndCode, string Date, string Time, string ArrDep)
        {
            return "http://ojp.nationalrail.co.uk/service/timesandfares/" + StartCode + "/" + EndCode + "/" + Date + "/" + Time + "/" + ArrDep;
        }

        public static Dictionary<string, string> GetCodes(string Filepath, char Limiter)
        {
            Dictionary<string, string> RDict = new Dictionary<string, string>();
            StreamReader sr = new StreamReader(Filepath);
            string[] SplitString;

            string CurrentLine = sr.ReadLine();

            while (CurrentLine != null)
            {
                SplitString = CurrentLine.ToLower().Split(Limiter);

                if (!(RDict.ContainsKey(SplitString[0])))
                {
                    RDict.Add(SplitString[0], SplitString[1]);
                }

                CurrentLine = sr.ReadLine();
            }

            sr.Close();
            return RDict;
        }

        static void Main(string[] args)
        {

            Dictionary<string, string> StationCodes = GetCodes(TrainCodesFilepath, Limiter);

            /*Console.Write("What station are you starting at?: ");
            string StartCode = StationCodes[Console.ReadLine().ToLower()];

            Console.Write("What station are you ending at?: ");
            string EndCode = StationCodes[Console.ReadLine().ToLower()];

            Console.Write("What date are you leaving? (Today, tomorrow or a date): ");
            string Date = Console.ReadLine().ToLower().Replace("/", "");

            Console.Write("What time are you needing?: ");
            string Time = Console.ReadLine().Replace(":", "");

            Console.Write("Do you want to depart or arrive at that time?: ");
            string ArrDep = Console.ReadLine().ToLower().Substring(0, 3);*/

            Console.Clear();

            string StartCode = "eps", EndCode = "wdo", Date = "today", Time = "1500", ArrDep = "dep";
            //string StartCode = "gld", EndCode = "wat", Date = "tomorrow", Time = "0930", ArrDep = "dep";

            string TrainTimeUrl = CreateUrl(StartCode, EndCode, Date, Time, ArrDep);
            string SourceCode = new WebClient().DownloadString(TrainTimeUrl);

            List<string> DepartureTimes = GetTimes(SourceCode, DepartureTimeFind, TimeSize);
            List<string> ArrivalTimes = GetTimes(SourceCode, ArrivalTimeFind, TimeSize);
            List<string> JourneyMinutes = GetDurations(DepartureTimes, ArrivalTimes);

            Console.WriteLine("Departing\tArriving\tDuration");

            for (int x = 0; x < DepartureTimes.Count; x++)
            {
                Console.WriteLine("{0}\t\t{1}\t\t{2}", DepartureTimes[x], ArrivalTimes[x], JourneyMinutes[x]);
            }

            Console.ReadKey();

        }
    }
}