FORM 2309
B-7-1 -87-3 M
UNION PACIFIC RAILWAY COMPANY.
CONSTRUCTION DEPARTMENT.
CHIEF ENGINEER'S OFFICE.
Omaha, Neb. Nov. 26th, 1888.
Theodore Cooper, Esq.,
Civil and Mechanical Engineer,
No. 35 - Broadway, New York City.
Dear Sir:-
In answer to your inquiry of the 5th inst., I give the
following:
Total lineal feet of iron bridges - - - - - - - - 14,461.
  "      "     "   "   "  trestles - - - - - - - - - 820
  "      "     "   " wooden bridges - - - - - - - 14,904
  "      "     "   "   "    trestles - - - - - - 245,847
(Miles of road covering same - - - - - - - - - - - 4,753.92)
Classification.	           Iron                   Wood
Spans over 500 feet - - - -none - - - - - - - - - none.
  "   400 to 500 - - - - - none - - - - - - - - - none
  "   300 to 400 - - - - - none - - - - - - - - - none
  "   200 to 300 - - - - -   5  - - - - - - - - - none
  "   150 to 200 - - - - -  40  - - - - - - - - -   9
  "   100 to 150 - - - - -  41  - - - - - - - - -  42
  "    50 to 100 - - - - -  11  - - - - - - - - - 114
  "    20 to 50  - - - - -  25  - - - - - - - - -  38
  "   less than 20 feet - - none - - - - - - - -  none

The classification given above applies only to wood and

(2)
iron bridges,as all wooden trestles on the Union Pacific system are designed with 16-feet spans. There are, however, a number of such trestles with one or more 20-feet spans; but no separate classification is made of such spans, as they are gradually being replaced with trestles of the shorter length.
Yours very truly,
V.G. Bogue
Chief Engineer.
G-W