This is now on my Medium

The intersection of Commercial Drive and Broadway is today a major interchange station between SkyTrain's Millennium and Expo lines, and the rapid bus 99 B-Line. Historically, this area has been of major importance the two BC Electric Railway's interurban lines which served east Vancouver (the Central Park and Burnaby Lake lines) merged with the street car serving Commercial Drive to then feed into downtown.

However, this produced a major choke point as having three different rail services interlining on a single street created serious congestion challenges for the BCER. A solution proposed in the 1920s was a proposal to extend the Central Park line from Victoria and Hull all the way to Main Street.