While the change in speed doesn't sound like a big deal, Prague's A line is home to some of the longest escalators in Europe, with the one at Námestí Míru being Europe's longest, some 87 meters long.
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Námestí Míru (Peace Square) metro escalator in Prague, the longest escalator in EU (length 87 m, vertical span 43.5 m, 533 steps, taking 2 minutes and 21 seconds to ascend or 2 minutes 19 seconds to descend without walking).
If you go to Kawasaki, Japan, stop at the JR Kawasaki station, go out the Southern Exit, cross the street to the More's Department store, then make your way down into the basement you'll see it: The World's Shortest Escalator.
At the time of construction the communists were worried that Prague might be targeted by the West as a great place to drop a nuclear bomb. So they created the metro deep underground to doubly serve as a nuclear bomb shelter.
With a vertical rise of 90 feet (27 m) and a length of 200 feet (61 m), the escalators at Angel station are the longest on the Underground, and in the United Kingdom.