g them directly over the posts of special timber
bents which spanned the two house tracks of the New York Central
south-bound freight shed, which the trestle here paralleled. This
position was held to a point 25 ft. west of the east house line of
Twelfth Avenue, where, by a system of cross-overs and turn-outs, access
was had from either track to six tracks on the pier. Four of these were
on upper decks, two on the north and two on the south edge of the pier,
at an elevation of 41 ft. above mean high tide, to carry earth and small
rock to chutes from which it was dumped into barges. The other two
tracks proceeded by a 5.3% grade down the center of the pier to the
lower deck where, at a distance of 540 ft. from the bulkhead, and beyond
the upper deck construction, they diverged into six, two on the north
and two on the south edge of the pier for standing tracks to serve
derricks, and two down the center for shifting purposes. A siding to the
north of the two running tracks just west of the bottom of the incline
served a bank of eight electric telphers. The arrangement of the pier is
shown by Fig. 4.

The trestle east of the steel structure at Eleventh Avenue had simple
four-post bents, as shown by Bent "_A_," on Fig. 5, all posts being
vertical, to save room at the street level; the outside posts and the
caps and sills were of 12 by 12-in. timber; the intermediate posts were
of 8 by 12-in. timber; and single or double decks of 3 by 8-in. bracing
were used, depending on the height of the bents. These bents were framed
on the ground in position and raised by hand. West of Tenth Avenue, the
sills of the bents rested on four 12 by 12-in. longitudinal timbers,
each spanning two bays and breaking joints, for convenience in
supporting the trestle while the tunnels were constructed in open cut
beneath. These bents were placed 12 ft. on centers, with one 8 by 16-in.
stringer under each rail, and one 6 by 16-in. jack-stringer supporting
the overhang of the floor on either side.

The bents along the New York Central freight shed had but two posts of
12 by 14-in. yellow pine varying from 26 ft, to 31 ft. 9 in. from center
to center; they had double caps of 12 by 14-in. yellow pine on edge, no
bottom sills or bracing, and the vibration and wind pressure were taken
care of by the top bracing and anchorage, as shown by Bent "_G_," on
Fig. 6.

[Illustration:
Fig. 4.
PLANT FOR DISPOSAL OF EXCAVATED MATERIALS PIER NO. 72 N.R.]