Translink has a fairly extensive network that connects Vancouver, Burnaby, New Westminster, Surrey and soon Port Moody and Coquitlam.
Everyday of the week local courier companies DRIVE between all of these cities to pick up and drop off local packages.
Why not leverage Skytrain’s network to achieve the same thing? Document couriers could easily use Skytrain for station to station deliveries – meeting a co-worker at whichever station is nearest to the final destination who would then drive or bike or walk the documents to their terminal address.
What about packages? Well, as long as the package could fit on the courier’s lap I’m guessing Skytrain would not have an issue with it.
Alternately there could be Drop Boxes for documents and packages at each station for pick up by the couriers – or even by individual addressees.