I never realised the Western train carrage had that really cool interior.....
(I try to avoid looking at the Western Train since the chances of me ever being able to justify buying it are virtually nil)
They are expensive, in Canada for a 4034 mint in the box never used I ended up paying over 1500.00CAD I have seen one other that went for 1700.00CAD and I got 4033 mint in the box still sealed for around 2100.00CAD (after shipping and taxes). You can get used ones with most of their pieces for around 600.00- 800.00 CAD without box or go for Playmobil 4054 and get one for about 400.00CAD without box. and purchase the rail cars stand alone. You can get them without boxes for 45-75 CAD.
4032 (UK version),4033 and 4034 are extremely rare for mint in the box ones, you will usually only find them used without a box or with a box that is in rough condition missing pieces. It was a very expensive item when they came out so to find one unopened you will need to be extremely lucky. What you can try doing is buying a broken one/ missing pieces and buy the bits that are missing.