Fairbanks Morse Erie-built

"ERIE-BUILT" A & B freight units

Total number constructed for PRR 48

36 A Units Nos. 9456A-9491A delivered between Nov. 1947 and Dec.
1948, all units retired 1962-1964.

12 B Units Nos. 9456B-9478B (even nos. only)delivered between
Nov. 1947 and Sept. 1948

height:              15'1" above rail

lenght:              64'10" between knuckles

trucks:              two A-1-A trucks
                      with a rigid 15"5" rigid Wheel base

engine:              10 cyl. FM 38D8 1/8 OP, 2,000 hp at 850 rpm.

gross weight:        314,000 lbs.

weight on drivers:   220,000 lbs.
                      (55,000 lbs on each driving axle.)

gearing:             70:17 with 42" wheels

max. speed w/gearing 68 mph

Continous T.E Rating 41,000 lbs at 15 mph.

road#  PRR Class.   const.#        contract#      delivered
#9456A    FF20      #L1108         LD29           Nov. 1947
 9456B      "        L1103          "             Nov. 1947
 9457A      "        L1110          "             Nov. 1947
 9458A      "        L1111          "             Dec. 1947
 9458B      "        L1106          "             Nov. 1947
 9459A      "        L1113          "             Dec. 1947
 9460A      "        L1114          "             Jan. 1948
 9460B      "        L1109          "             Nov. 1947
 9461A      "        L1116          "             Jan. 1948
 9462A      "        L1121          "             Jan. 1949
 9462B      "        L1112          "             Nov. 1947
 9463A      "        L1122          "             Jan. 1948
 9464A      "        L1123          "             Feb. 1948
 9464B      "        L1115          "             Dec. 1947
 9465A      "        L1124          "             Feb. 1948
 9466A      "        L1130          "             Feb. 1948
 9466B      "        L1125          "             Dec. 1947
 9467A      "        L1131         LD29           Feb. 1948
 9468A      "        L1132          "             Feb. 1948
 9468B      "        L1126          "             Dec. 1947
 9469A      "        L1132          "             March 1948
 9470A      "        L1134          "             Feb. 1948
 9470B      "        L1129          "             Dec. 1947
 9471A      "        L1135          "             March 1948
 9472A    (FP20a)*   L1140         LD35           June 1948
 9472B      "        L1146          "             June 1948
 9473A      "        L1141          "             June 1948
 9474A      "        L1148          "             June 1948
 9474B      "        L1147          "             June 1948
 9475A      "        L1149          "             June 1948
 9476A      "        L1150          "             July 1948
 9476B      "        L1144          "             July 1948
 9477A      "        L1151          "             July 1948
 9478A   (FP20)#     L1152          "             Sept. 1948
 9478B      "        L1158          "             Sept. 1948

______________________________________
*Pennsy Power II states that units 9472A-9477A, 9472B, 9474B and
9476B, all part of order LD35 were built as class "FF3" but
reclassified as FP20a and modified to the standard Fairbanks
Morse passenger gearing of 64:23 giving them a continous T.E. of
27,400 lbs. at 23 mph with a top speed of 100 mph. The modified
Erie-Builts weighed 27,000 lbs heavier than the stock units. The
A units weighed 341,880 lbs with 236,200 on the drivers, 59,050
per powered axles. The regeared B units weighed 334,880 lbs. with
232,600 on the drivers, 58,150 lbs on each powered axles.

     These figures differ slightly with FM'standard passenger
configuration of a 63:24 gearing giving the unit a continous T.E.
of 27,500 lbs at 24 mph with smaller, 40" inch, wheels. The
units' larger 42" wheels may be responsible to the slight
variation in performance. While the weigh changed, PPII is mute
as to the reason. There is no indication if a steam generator and
water tanks were added to any of these nine units. All eventually
were restored to the stock FF20 configuration.

     #PPII states A-B-A lashup, 9478A, 9478B and 9479A, built as
one of order LD 35's class "FF3," was reclassified as FP20 with
the same regearing but with adifference in ballasting. These A
units were 10,000 lbs. lighter than the other six regeared "A"
Erie-Builts. The B units were 2,000 lbs lighter than the other

 9479A    (FP20)     L1153         LD35           Sept. 1948
 9480A     FF20      L1154         LD45           Oct. 1948
 9481A      "        L1155          "             Oct. 1948
 9482A      "        L1156          "             Dec. 1948
 9483A      "        L1161          "             Nov. 1948
 9484A      "        L1162          "             Oct. 1948
 9485A      "        L1163         LD45           Oct. 1948
 9486A      "        L1164          "             Oct. 1948
 9487A      "        L1165          "             Oct. 1948
 9488A      "        L1166          "             Nov. 1948
 9489A      "        L1167          "             Nov. 1948
 9490A      "        L1168          "             Nov. 1948
 9491A      "        L1169          "             Dec. 1948
_________________________________
three modified B units. PPII states 9478A and 9478A weighed
331,000 lbs with 230,800 on the drivers. 57,700 per powered axle,
while 9478B weighed 332,800 lbs with 232,100 on the drivers,
58,025 lbs on each powered axle.

Like the nine FP20as these three FP20s were restored to the
original as-delivered FF20 freight configuration.