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Center Entrance in Boston - Part 4
By Alfred Barten
I wrote this article for Electric Lines magazine, which published it in their May-June 1992 issue. I’ve omitted a few of their minor edits, reverting to my original manuscript (mostly because the edits didn’t change anything significant, and trying to search them all out seemed unnecessary), added some illustrations and omitted several others because they are no longer available.
This is the fourth of four parts. - AB
Part 1 - Introduction
Part 2 - Historical Development
Part 3 - Boston Center-Entrance Cars
Part 4 - Boston Center Entrance Car Characteristics
Boston Center Entrance Car Characteristics
Boston center-entrance cars were built in four distinct groups from 1917 through 1921 as described in the accompanying table. All but the last two groups supported multiple-unit capabilities.
| Type |
CEM-1 |
CEM-1A |
CEM-1B
6100 Class |
CEM-1B
6200 Class |
CEM-1C |
CEM-1D |
| Builder |
Brill |
Laconia |
Kuhlman |
Kuhlman |
Laconia |
Kuhlman |
| Year Built |
1917 |
1917 |
1919 |
1919 |
1921 |
1921 |
| Numbers |
6000-6049 |
6050-6099 |
6100-6199 |
6200-6299 |
6300-6329 |
6330-6404 |
| Trucks |
Laconia
arch bar |
Laconia
arch bar |
Brill 77-E-1 |
Brill 77-E-1 |
Taylor RH |
Taylor RH |
Control
System |
Sprague
GE PC-5 |
Sprague
GE PC-5 |
Sprague
GE PC-5 |
Westinghouse
ABPC |
GE |
GE |
| Controllers |
CJ-135A
Master |
CJ-135A
Master |
CJ-135A
Master |
32-A Master |
K-35GR2
series-parallel |
K-35GR2
series-parallel |
| MU Capab. |
4-car train |
4-car train |
4-car train |
4-car train |
None |
None |
| Wheel Dia. |
24 inches |
24 inches |
26 inches |
26 inches |
26 inches |
26 inches |
| Weight |
43,970 lbs |
45,260 lbs |
45,040 lbs |
44,420 lbs |
43,060 lbs |
44,840 lbs |
Seated Capac.
Lead Car |
58* |
58* |
56 |
56 |
56 |
56 |
Seated Capac.
Trail Car |
60* |
60* |
56 |
56 |
n/a |
n/a |
Standing
Capacity |
95 |
95 |
104 |
104 |
104 |
104 |
* Reduced to 56 in 1919 when cab seating privileges were revoked.
All cars were equipped with 4 GE 247H 40 hp, 600 vdc motors, except type CEM-1B 6200 class cars, which used 4 Westinghouse 514 motors.
All cars measured 47 ft. 5 in. over dashers, 48 ft. 9 1/2 in. over anti-climbers, 8 ft. 8 3/4 in. width over doors, 24 ft. 0 in. between truck centers, and 5 ft. 6 in. wheel base.
All cars had a maximum speed of 30 mph at 550 vdc.
All cars used Westinghouse SME straight air brake system with DH-16 compressors, except type CEM-1B 6200 class cars, which used GE Electro pneumatic system wih CP-27B compressors.
Al
Part 1 - Introduction
Part 2 - Historical Development
Part 3 - Boston Center-Entrance Cars
Part 4 - Boston Center Entrance Car Characteristics
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�2006 Alfred Barten. All rights reserved.
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