It is possible to get to 100% of products in theory if you have lots and lots and lots of stations and trains for the same industry... But it's not rentable.
The way it works is that the game calculate how much time it take you to take the products out of the industry stores and the faster you go, the higher the rating. To rentabilise everything you should look in how much products you'll be able to haul more for a given increase and try to stabilise your line before it cost you too much in engines and maintenance.
Breakdowns can slow down lines to a crawl unless you put up a well designed lines with at least some crossovers to go around the broken down trains.
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