Sunil, I feel your pain with access via an old railbed. I suffer the same with the one that runs along my property. Being converted into a walking path did nothing but promote the area and make things worse.
As for your slabs... am I reading correctly that these are not actually on your property? If this is the case I'd say you'd have something of a hard time getting law enforcement to help you in regards to 'slabs' used to dam a stream that isn't on your own property. Going with some manner of deterant (non-harmful) is likely your best choice.
People will steal just about anything... I see people taking plant cuttings, stones, etc. from property along roads all the time. Somehow they think that if they can get to it whilst still being on the public part of the road property that it is fair game.
Owner/Builder of Ottawa Canada's first official off-grid home.
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