IT Compatible Numbering Schemes
Due to the introduction of computers/IT in the late 1960s it became necessary to revise the numbering schemes, as the old numbers could not tell whether a class 10 might be a steam or an electric locomotive without including the prefix letters, which were difficult to process by computers of the day. Another problem was both class and ordering numbers could vary in length under the old system.
Read more about this topic: German Locomotive Classification
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