- The work, made by New York artist Miya Ando
- It was crafted out of steel recovered from the World Trade Centre
- It sculpture was commissioned by the 9/11 London Project to mark the launch of its programme to educate schoolchildren about the attacks
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Members of the GMB union are protesting at changes to pay arrangements, including moving from weekly to monthly pay.
Transport for London gave away more than 22,000 travel passes last year under the 'Staff Nominee' scheme.
The horrific attack happened at around 10:45pm on a grass area near Barge Walk, in Kingston, south west London.