A lot of lines have more trains at peak times (before 09:30 and between 16:30 and 18:30.) However, on a lot of lines there's also a shoulder peak period (quite often 09:30-11:00 and 15:00-16:30) which can have passenger numbers approaching the peak level but with an off-peak frequency. However are there any local lines which have extra trains in the shoulder peak period?
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