Auntie from Jozi is correct. the nearest Gautrain station to Lanseria would be Centurion, over 20km, as the crow flies, further by road.
As far as shuttles are concerned, I am not aware of any regular scheduled shuttle between the two airports.
However, others may know more.
Remember, Google is your friend.....You could try looking at the following:
firstcarrental.co.za/-lanseria-airport-trans…
transfersandshuttles.co.za/shuttles/…
Good luck.
Gavin, Owner, Serval Tours and Transfers
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