Arriving simultaneously after 5 hours travel

My partner and I decided to celebrate my birthday with a few winter days in Amsterdam. We drove for an hour to Bristol Airport and waited 2 hours before flying for about an hour to Amsterdam's Schiphol Airport, one of Europe's largest with 165 boarding/arrival gates. Once off the plane we had a 10-15 walk to baggage reclaim before buying train tickets to Amsterdam Centraal Station, a 15 minute train ride away. The railway station is immediately below the airport's concourse with a number of escalators down to the platforms. There are 7 trains per hour from Schiphol to Amsterdam from various platforms. When the train arrived it was a double-decker train (common in Holland). We chose the closest door to get into a non-smoking carriage (this was 2002) and chose to go upstairs. We walked towards the middle of the carriage and sat down. As the train pulled out of the station a man's voice was calling the name of my partner. The man and his wife had boarded the same non-smoking carriage as us (despite them being smokers) from doors at the opposite end to the doors we chose and they had also chosen to go upstairs. They had driven 30 minutes to Stansted Airport (150 miles from Bristol), waited 2hrs, flown for an hour to Schiphol, arrived at another of the 165 Gates, walked 10-15mins to baggage reclaim, bought their rail tickets and chosen to descend to one of the various platforms to catch any one of the 7 trains per hour into Amsterdam, by coincidence the same train that we chose. Perhaps the strangest of these coincidences is the numerous independent timings that led up to us all catching the same train, entering the same carriage, going upstairs and meeting in the middle of the upper deck. I didn't know this couple at the time but, in the year before I met my partner, they had been her holiday reps at a resort in the south of France! Any number of obstacles could have caused us not to have met, to have been on different trains or in different carriages, but because of that brief coincidental meeting we have since enjoyed several holidays at the tranquil retreat the couple had just bought in Spain, which opened the following summer.