London's ultimate landmark is the Tower Bridge. It was the first bridge across the Thames downstream of the old docks.	All bridges in London are funded by a trust fund and not owned by the city. There is no charge for ships to pass the bridge, even though they need to give 24 hours notice	. The bridge needed to allow access to the docks for large vessels. Hence an opening mechanism was required.
The original hydraulic motor is still in the machine room below the pillar. It is fully operational and was only replaced to reduce maintenance cost.	The original drive shaft was disconnected and the original hydraulic motor was replaced by a new, compact hydraulic motor. All other original mechanics remain.	The accumulator stores water under pressure to supply enough water to raise the bridge fully. The pressure pumps are located next to the bridge.

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