vicarage pointed out to me that on Sunday Crossrail will be running tours of some bits of Brunel's railway (the remains of an engine shed's floor, track beds, etc.) that have been dug up while excavating the old shunting yards at Westbourne Park, just down the road from me, as part of the project. Ought to be interesting, I hope, and it's so close that it's definitely worth taking a look. You have to book tickets in advance, I've booked for 1 PM.
Details of it here:
http://londonist.com/2014/10/visit-the-remains-of-brunels-railway-at-paddington.php Book tickets here:
http://www.eventbrite.co.uk/e/crossrail-layers-of-london-brunels-railway-heritage-uncovered-sunday-5-october-2014-tickets-13435468849