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Guard rails are used on sharper curves to reduce the load on the rail on the outside of the curve. They do this by bearing on the back of the opposite wheel. I've travelled on an industrial museum's rail line (the Bristol Industrial Museum - they've saved a fairly large chunk of the old dockyard rail network and operate small steam locos with old 4-wheel opens fitted with bench seats, worth a look if you're ever near Bristol), which had a few such curves - riding in an old GWR brake van (caboose) around these was an interesting experience - fairly long 4-wheel chassis + tight curves = some awful squealing noises from the flanges!
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