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- Aug 12, 2010
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It requires work; the main thing I've seen increasing these are:
1. Harbor Districts / Unique Districts replacing Harbors.
2. Commercial Districts / Unique Districts replacing Commercial ones.
Both of these increase the trade route cap by one.
So the Colossus may not be very good for a "wide" civ, but a "tall" one would find that extra trade route to be quite useful.