I thought 4 was North American but was looking too far north in your Canadian ports.
The PATH - [Port Authority Trans Hudson] is an oddball in many ways - not a part of the main New York Subway system and with its own map. A little bit like ThamesLink having its own map in London (another thread running on that at the moment). The long red tail is out to Newark ... Lisa and I stayed in Newark for a few days a number of years ago and used the PATH into Manhattan; I remember buying a multi journey ticket and passing in back over the barrier to let the second one of us swipe through a few seconds behind ... on the advice of the staff. How things differ!
I should have guessed the Brill Tramway as it has been a favourite of mine since student days when I traced the part of the old line from Wotton up to the gated boundary of the then - semi-secret -rocket research facility, now a business park. From the 1920's Wotton was shown as a 'UndergrounD' interchange with the Great Central whose station master it shared. A more bazaar outpost of the Metropolitan Railway is hard to imagine - but still it ensured that No. 23 is still with us today.
It is indeed fascinating ... on my list of "places I would want to take a look at if in the area" ...
