"Wait, why is the tube turning North? We're supposed to go East!".
This is actually very irritating for inexperienced tube users.
For example, the Piccadilly line is often signed as running Westbound and Eastbound, but a significant part of it runs North-South, according to all the maps, and compared to the Victoria Line which is indeed signed Northbound and Southbound.
Then Euston-Kings Cross is Northbound on one line, and Southbound on another.
I concur -- travelling in Boston can be frustrating for those who are inexperienced. They use 'inbound' and 'outbound', but without knowledge of the centre point for that line this information is useless!
This is actually very irritating for inexperienced tube users.
For example, the Piccadilly line is often signed as running Westbound and Eastbound, but a significant part of it runs North-South, according to all the maps, and compared to the Victoria Line which is indeed signed Northbound and Southbound.
Then Euston-Kings Cross is Northbound on one line, and Southbound on another.