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Boston & Maine class T-1

T-1a No. 4008 in April 1939 in Billerica, Massachusetts

In 1928, the Boston & Maine procured their first 20 Berkshire-type locomotives from Lima. This meant a leading axle , four driving axles and a two-axle bogie under the firebox . Thanks to the bogie , the grate area co...

	Boston & Maine class T-1 Remove
Variant	T-1a T-1a T-1b
Built	1928
Manufacturers	Lima
Wheel arrangement	1D2
Gauge	1435 mm
Length
Service mass	178262 kg
Top speed
Power
Engine

General

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Built	1928
Manufacturers	Lima
Wheel arrangement	2-8-4 (Berkshire)
Gauge	1,435 mm

Dimensions and weights

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Wheelbase	12.71 m
Service mass	178.3 t
Adhesion mass	113.5 t
Total mass	276.4 t
Rigid wheelbase	5.03 m
Axle load	28.6 t
Water capacity	45,425 l
Fuel capacity	16.3 t (coal)

Boiler

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Grate area	9.29 m²
Firebox surface	37.626 m²
Tube heating surface	439.246 m²
Evaporative heating surface	476.872 m²
Superheater surface	198.441 m²
Total heating surface	675.3 m²

Power plant

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Driver diameter	1,600 mm
Boiler pressure	14.5 bar
Expansion type	simple expansion
Cylinders	two, 711 x 762 mm

Power

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Power source	steam
Estimated power	3,281 kW (4,461 PS)
Starting effort	296.4 kN
Starting effort booster	53.379 kN

Calculated values

Property	Boston & Maine class T-1 T-1a T-1a T-1b Remove
Factor of adhesion	1 : 3.76
Optimal speed	68 km/h
Power-to-weight ratio	18.4 kW/t
Heating Surface Equivalent	1,061.9 m²
Cylinder volume/HSE	1 : 570.14
Adhesive weight/Total	1 : 1.57
Tractive force/Heating surface	1 : 9.17
Grate area/Heating surface	1 : 72.69
Firebox/Tube surface	1 : 11.67
Total/Superheater	1 : 2.40

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