The look and sound of a wet road and the repetitive whine of windscreen wipers are inextricably linked to my memories of childhood Saturdays, and as we make our way back to Hanoi from Halong Bay in the “limousine bus” this particular Saturday is doing its best to trigger those memories. We knew to expect inclement weather during this spell, it’s that time of year here in the north. No visit to Hanoi is complete without a trip to Train Street, so, given that we are passing back through the city at a weekend when there are more trains scheduled than at other times, we play the game of grabbing…