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How Tower Bridge nearly lost a bus
Tower Bridge nearly lost a bus. Its road was rising under the wheels. What could lift a road that big? It was 1952. The watchman forgot the bell, so the driver floored it and jumped the gap. Each half of that road is a seesaw: over a thousand tonnes, balanced by a weight that swings down into the pier. But a seesaw still needs a push. And this push was stored up, waiting. At the south end, coal fires burned day and night, so green steam engines could charge six giant Victorian batteries. Oil does the work now, but those green engines are still there. After the walkways, follow the blue line on the pavement to the Engine Rooms. Those batteries never held electricity. They held water, squeezed hard. That bus was lifted by water.
If you go: At Tower Bridge, after the high-level walkways, follow the blue line on the pavement to the Victorian Engine Rooms (on the same ticket): the green steam engines that once lifted the roads are still there.
Sources: towerbridge.org.uk