It seems that a CAD box should be defined as a contiguous geographic area that has the same "running assignment" up to however many alarm levels are desired. The next issue is if you want to identify this box by the nearest fire house or nearest engine company.
If BCFD is using the nearest firehouse, then this should be T20-41 to avoid confusion with Engine 20's CAD boxes across town.
This number still doesn't look right, saying Truck 20 has at least 41 CAD areas (not to mention the coincidence of 41-20 versus 20-41). Logically, as one gets closer to the city's boundaries, the larger the CAD box area becomes due the decreasing number of response routes. In this case, once you get past Engine 50 and Truck 20, everybody else is coming in via Eastern Avenue- unless Baltimore County is on the box via automatic aid. Why didn't they just keep the old street box numbers as phantom (dummy) boxes?
Engine 11 and Truck 24 were originally put out there to protect the hospital, Putting Truck 20 in there must have been a cultural shock to everyone.
Engine 41 was originally a Baltimore County company until the 1919 annexation. Truck Company 20 was put in service on January 1, 1920 with Engine 41. So 20 Truck was a fixture In Highlandtown (where the fire hydrants are painted in the colors of the Italian flag) for almost a hundred years.