Quick thinking from engineers prevented cement from setting in the Victoria Line signal room which would have caused even further disruption to commuters.
Peter McNaught, operations director for the Bakerloo, Central and Victoria lines, said it was lucky workers knew sugar would stop the cement setting.
Normal service has resumed on the line after engineers worked throughout the night to repair the damage.
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Met Constable Thomas Hooper is said to have taken the medium-sized two-tier tin of biscuits from a storage cupboard.
7-year-old George Lockley has Spinal Muscular Atrophy which means he uses a wheelchair and is slowly getting weaker.
The car has around 210bhp and can accelerate from 0-60mph in 5.5 seconds and hit a top speed of 150mph.