Banner
Navigation
loco-info.com
The reference for locomotives and railcars

Pere Marquette classes N to N2

United States 1937 39 produced
No. 1225 marked “Polar Express” in December 2004 in Henderson, Michigan Stephen Wilder PD

For use in front of fast freight trains, the Pere Marquette also chose the 2-8-4 “Berkshire” wheel arrangement in the late 1930s. It was able to develop great power at speeds of up to 70 mph thanks to the large firebox above the bogie. Of a total of 466 square feet in the firebox, 122 were made up of thermosiphons and water pipes. This allowed 26 by 34 inch cylinders to be operated with 69 inch wheels.

The first delivery from 1937 included 15 class N locomotives. The last five of these had a booster in the bogie. In the years 1941 and 1944 twelve more N1 and N2 each followed. When the Pere Marquette was merged into the Chesapeake & Ohio in 1947, the N1 and N2 classes became the N-1 and N-2 and the N class became the N-3. The two newer series, which had not yet been paid for by the C&O, kept the color scheme and the old numbers.

From 1951 the locomotives were also used on routes other than those originally operated by the Pere Marquette. The first series was scrapped by 1954. The use of the newer machines ended in 1958 and a total of 13 units were stored until 1961, as payments were still outstanding.

Numbers 1223 and 1225 are still preserved today, both of which belong to class N1. The 1225 is the only still functional Pere Marquette locomotive today. It has been used intermittently since 1985 and formed the basis for the locomotive in the book and film “The Polar Express”. Today it is used almost every year around Christmas time on the “North Pole Express” in Michigan.

Technical data

General

Built
1937, 1941, 1944
Manufacturers
Lima
Wheel arrangement
2-8-4 (Berkshire)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
31.00 m
Wheelbase
12.80 m
Total wheelbase
26.89 m
Service mass
200.7 t
Adhesion mass
125.9 t
Total mass
365.6 t
Rigid wheelbase
5.55 m
Axle load
31.5 t
Water capacity
83,279 l
Fuel capacity
20 t (coal)

Boiler

Grate area
8.389 m²
Firebox surface
43.293 m²
Tube heating surface
400.505 m²
Evaporative heating surface
443.798 m²
Superheater surface
179.489 m²
Total heating surface
623.3 m²

Power plant

Driver diameter
1,753 mm
Boiler pressure
16.9 bar
Expansion type
simple expansion
Cylinders
two, 660 x 864 mm

Power

Power source
steam
Estimated power
3,356 kW (4,563 PS)
Top speed
113 km/h
Starting effort
308.6 kN

Calculated values

Factor of adhesion
1 : 4.00
Optimal speed
66 km/h
Power-to-weight ratio
16.7 kW/t
Heating Surface Equivalent
1,019.2 m²
Cylinder volume/HSE
1 : 580.46
Adhesive weight/Total
1 : 1.59
Tractive force/Heating surface
1 : 10.34
Grate area/Heating surface
1 : 74.30
Firebox/Tube surface
1 : 9.25
Total/Superheater
1 : 2.47

Topics

  • steam locomotive
  • freight
CompareComment
Last changed: 02/2023

Watch on YouTube

Auf Deutsch umschalten

Settings

Your settings are retained for this browser session only.

Consent to cookies

We use cookies to save your display settings. If you decline, the settings are retained only for the current browser session.