make this change of motive power, or to transfer passengers, will not
exceed 3-1/2 min.

The plan at Harrison provides at present for two platforms, each 1,100
ft. long and 28 ft. wide, and having ample shelters and waiting rooms,
connected by a 12-ft. tunnel under the tracks, provision being made for
two additional platforms when necessity requires their construction. The
platforms are supported on walls of reinforced concrete, with an
overhang to provide a refuge for employees from passing trains. The
concrete walls are supported on wooden piles, prevented from spreading
by 7/8-in. tie-rods at 10-ft. intervals, and embedded in concrete under
the paving of the platform. As the elevation of the top of the platform
is +21.83, and the top of the piles is +14.54 above mean tide, the piles
will, of course, decay; but, as the embankment has been completed for
some time and is well packed and settled, the concrete being deposited
directly on the embankment, very little trouble from settlement is
anticipated when the piles decay. The surface of the platforms, with the
exception of the edges, is to be of brick, on a concrete base; and, if
settlement occurs, the bricks can be taken up and re-surfaced. The tops
of the platforms are 3 ft. 10 in. above the top of the rail and on a
level with the floors of the cars, so that passengers may enter or leave
trains without using steps, as all cars which will enter the
Pennsylvania Station, New York City, are to be provided with vestibules
having trap-doors in the floor to give access to either high or low
platforms. Details of the platforms are shown on Plates XVIII and XIX.

As planned at present, there will be four main running tracks, one
adjacent to each side of the two platforms, providing standing room for
four of the longest trains, two in each direction, or double the number
of trains of ordinary length, so that passengers having to transfer from