History
Before the advent of the Ae 6/6, trains on the Gotthard route were hauled mainly by Ae 4/6, Ae 4/7 and Be 6/8 ("crocodile"), which were underpowered by contemporary standards. This led to many trains needing bank engines on the Gotthard ramps, and adding them was a tedious, uneconomical and impractical procedure.
Read more about this topic: SBB-CFF-FFS Ae 6/6
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