This Western Passenger Train by Playmobil, set number 4001 was the second train ever released by Playmobil, it was numbered 4001, 4002, 4003 and 4004 depending on what year it was released. They were absolutely identical, just different box numbers.
Playmobil did not manufacture the train rails, they were licensed and sold to Playmobil so they could use with their trains by LGB, scale G at 600mm. If you ever want to buy more train rails and can’t find them, just search for the “LGB G Scale 600mm rails” and you will get a ton! They are exactly the same, made by the same manufacturer.
Above you can see a opened box with all the accessories inside, playmobil would pack the LGB train rails inside a blue box labeled Playmobil, followed by a box with the transformer and cables to connect to the train rails.