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The reference for locomotives and railcars

Central RR of New Jersey classes L-6 to L-8

Central RR of New Jersey classes T-38 and T-40

United States 1910 40 produced
No. 780 in November 1948 at Jersey City, New Jersey collection Taylor Rush

After the classes L-3 to L-5, the ten L-6a built in 1910 were the next Camelback ten-wheelers for commuter service in the roster of the Central Railroad of New Jersey. They still had 69-inch drivers, but were somewhat heavier than their predecessors and had larger cylinders. With their massive Wootten firebox and no full cab behind it, they had a very compact appearance and looked relatively short.

In 1912, ten superheated L-7s followed with cylinders of 23 instead of 22 inches. Between 1928 and 1941, all L-6a were also rebuilt to the L-7s standard by adding a superheated boiler and larger cylinders. The L-7as was created by widening the grate and again a total of ten were built in 1913 and 1914. 1918 saw the introduction of the L-8s, of which again ten were built. These were very similar to the L-7as, but had a higher boiler pressure.

All of these had been built by Baldwin and they got consecutive numbers between 750 and 789. In the new class scheme, the L-7a and L-7as became class T-38, where the “T” stood for the 4-6-0 wheel arrangement (Ten-wheelers) and the 38 stood for a starting tractive effort of 38,000 pounds. In the same way, the L-8s became class T-40. All reached the end of steam, with their retirements only occurring between 1950 and 1954.

Technical data

General

Property L-6a L-7s L-7as L-8s
Built 1910 1912 1913-1914 1918
Manufacturers Baldwin
Wheel arrangement 4-6-0 (Ten-wheeler)
Gauge 1,435 mm (Standard gauge)

Dimensions and weights

Property L-6a L-7s L-7as L-8s
Wheelbase 7.57 m 7.58 m 7.67 m 7.68 m
Total wheelbase 15.89 m 17.09 m 17.20 m
Service mass 88.5 t 102.1 t 102.3 t
Adhesion mass 68 t 76.7 t 77.5 t
Total mass 158.3 t 168.8 t 171.2 t
Rigid wheelbase 4.12 m
Axle load 22.7 t 25.6 t 25.9 t
Water capacity 26,498 l 28,391 l 28,769 l
Fuel capacity 14.5 t (coal) 10.9 t (coal) 11.8 t (coal)

Boiler

Property L-6a L-7s L-7as L-8s
Grate area 7.581 m² 8.491 m²
Firebox surface 18.488 m² 19.417 m² 19.974 m² 19.603 m²
Tube heating surface 258.549 m² 192.031 m² 194.26 m² 194.632 m²
Evaporative heating surface 277.037 m² 211.448 m² 214.235 m²
Total heating surface 277.0 m² 255.5 m² 258.6 m²
Superheater surface 44.036 m² 44.315 m²

Power plant

Property L-6a L-7s L-7as L-8s
Driver diameter 1,753 mm
Boiler pressure 14.5 bar 13.8 bar 15.2 bar
Expansion type simple expansion
Cylinders two, 559 x 711 mm two, 584 x 711 mm

Power

Property L-6a L-7s L-7as L-8s
Power source steam
Estimated power 1,119 kW (1,521 PS) 1,156 kW (1,572 PS) 1,193 kW (1,622 PS) 1,342 kW (1,825 PS)
Starting effort 155.9 kN 170.4 kN 162.3 kN 178.6 kN

Calculated values

Property L-6a L-7s L-7as L-8s
Factor of adhesion 1 : 4.28 1 : 4.41 1 : 4.68 1 : 4.26
Optimal speed 43 km/h 42 km/h 45 km/h 47 km/h
Power-to-weight ratio 12.7 kW/t 11.3 kW/t 11.7 kW/t 13.1 kW/t
Heating Surface Equivalent 369.5 m² 396.6 m² 402.7 m² 400.9 m²
Cylinder volume/HSE 1 : 944.14 1 : 961.34 1 : 946.71 1 : 951.09
Adhesive weight/Total 1 : 1.30 1 : 1.33 1 : 1.32
Tractive force/Heating surface 1 : 11.76 1 : 13.93 1 : 13.11 1 : 14.42
Grate area/Heating surface 1 : 36.54 1 : 33.70 1 : 30.45
Firebox/Tube surface 1 : 13.98 1 : 9.89 1 : 9.73 1 : 9.93
Total/Superheater 1 : 4.80 1 : 4.83
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