Unfortunately North London isn't your ideal place for model shops. I used to live in Crouch End for a while and I can tell you that it has an awesome array of Indian Restaurants and trendy cafes. So maybe go for a curry instead.
There is an interesting walk that goes through Crouch End too called Parklands walk which follows the old rail track from Highgate to Finsbury Park. The track has been lifted now but you see remnants of the old Crouch End station platform and go over old railway bridges. That's about as railway as it gets I'm afraid.
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