STEAM LOCOMOTIVES:
120
Bangor & Aroostook 4-8-2 (Mountain) Type Freight Locomotive, Classes M-A
4-8-2
Type
to M-J, Nos. 100-109.
Built
the following years, Nos. 100-103 in 1929, 104-106 in 1930, 107-108 in 1935
Tractive force Cylinders, diameter and stroke Drivers, diameter
Weight on drivers Total weight of engine
22 /i l
by the American Locomotive Company
and 109
Weight
in
233,000
49,200
lb.
x 30
in.
of tender Driving wheel base
16
ft.
6 in.
63
in.
Total engine wheel base
38
ft.
1
214,500 318,500
lb.
Steam pressure Tender capacity
in.
lb.
in
1945.
240
lb.
in. lb.
12,500 gal., 18 tons
A comparatively light weight Mountain type locomotive built to haul through freight trains between Northern Maine Jet., and Oakfield and Houlton, Maine. Several novel features were incorporated in their design including an arrangement of a crosshead and guide support that allowed a shorter main rod to be used thereby allowing better balancing of reciprocating parts. No knuckle pins were used in the side rods and the leading truck was equipped with outside journal bearings similar to that used in car trucks.