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Why are the platform humps on all the lines apart from the met line about 3 cm below the floor of the train? (On the met line they are level with the floor of the train).
The humps cost around a million pounds each and can be completed in a short shut-down. Things on the platform need to be modified such as benches, and there are other platforms with low ceilings preventing this.
Even ignoring the cost and the time, only small parts of the train are accessible for wheelchairs.