Here is the definition from TransLink:
Quote:
B-Line Rapid Transit
B-Line routes provide high frequency, limited-stop bus rapid transit service in several of the region’s busiest travel corridors. Most routes use a dedicated fleet of specially painted, 18 metre articulated buses. B-Line routes extend the rapid transit network from SkyTrain stations to major town centres and activity centres.
Express Coach
Express Coach routes provide fast direct service for longer distance commuter trips between suburban areas and downtown Vancouver or to other regional centres, using highway-style coaches.
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Which one should the #555 fall under? The #555 does not have enough frequency to meet the B-Line standard, it is not a limited stop BRT (in fact, it is a non-stop highway shuttle), and it does not use articulated buses. The #555 is an Express Coach as it meets every criteria for it.
If the #555 can be considered to be a B-Line, why not call all express route as a B-Line? The 32 B-Line, 43 B-Line, 44 B-Line, 84 B-Line, 135 B-Line, 160 B-Line, 169 B-Line, 189 B-Line, 257 B-Line, 337 B-Line, 311 B-Line, 351 B-Line, 352 B-Line, 354 B-Line, 394 B-Line, 595 B-Line, 601 B-Line, 602 B-Line, 603 B-Line, 604 B-Line, 620 B-Line, 791 B-Line, and a future 503 B-Line, etc... Soon, there will be no more value for the brand since there are so much of them everywhere...