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Near constant engineering works, signal and track failures.
Plus most tracks are running very close to capacity, so it only takes one small incident to cause major knock on effects as trains get delayed, retimed, etc and the platforms have to shuffle around to accommodate them.
Most of the time trains are consistent, except when they're not.
Well. German train stations tend to have far more platforms than the equivalent British station. For instance, where a British station has four or six, a German station will probably have 10+. While that makes it easier to assign platforms, you also have to remember that in Germany platforms are changed around from the announced one a lot of the time if trains are late. Also, Germany's railways were built much later than Britain's Victorian railways and so planners already had a much clearer idea of the potential of railways and over-planned. Lots of other reasons, I'm sure.
Near constant engineering works, signal and track failures.
Plus most tracks are running very close to capacity, so it only takes one small incident to cause major knock on effects as trains get delayed, retimed, etc and the platforms have to shuffle around to accommodate them.
Most of the time trains are consistent, except when they're not.