It is to be remarked that while these new arrangements greatly reduce
the passenger and freight water transportation, they have no effect on
the large vehicular traffic across the North River which must continue
to be conducted by ferries until it can be otherwise provided for. As
long as these conditions exist, ferry-boats must be used in large
numbers and continue to obstruct the North River. This difficulty
probably cannot be overcome by the construction of bridges, as in the
case of the East River, but it does not seem too much to expect that,
eventually, tunnels to provide for the vehicular traffic, like the
Blackwall tunnel under the Thames, will be established under the North
River.

It would be interesting to estimate the increase in railroad traffic
capacity resulting from these improvements, but the data required for
this purpose are not available. Some idea of the increase in passenger
traffic capacity resulting from the establishment of the tunnel line may
be obtained by comparing the proposed daily train-movements for the new
station with the train-movements at other important railroad stations.
The daily train-movements of six such stations are given in the
following table:

Total trains Movement
in and out at
for 24 hours. maximum hour.

Jersey City 281 29
Broad Street Station, Philadelphia 538 48
Union Station, St. Louis 462 89
South Terminal Station, Boston 861 87