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I've run up the towpath from limehouse has far as Springfield park but I fancy the idea of getting the train up to Waltham Cross and running one way back to Limehouse (ie running home from outside the M25 has an appealing ring to it!). It looks open and do-able on mostly towpath (Olympic bit has re-opened now for example). It's the bit higher up I'm not sure about. Anyone here know it/run it?