Most likely Finch Express since TTC prefers to use the artics on express routes. Here are the list of routes that could potentially (some will be) be converted to artic operation and the amount of buses that they would need based on the current service summary and when the most buses are needed (usually during rush hour): 903 Kennedy-Scarborough Centre Express (when it merges with 913): with artics possibly 6 buses 905A Eglinton East Express - current 10 buses, with artics 6 buses
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