The reference for locomotives and railcars
Bavarian Pt 2/4 N
German Reichsbahn class 721
Germany | 1909 | 2 produced
Axle config4-4-0T (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length29 ft 8 7/8 in
Service weight85,980 lbs
Adhesive weight57,761 lbs
Axle load29,101 lbs
Water capacity1,585 us gal
Fuel capacity2,425 lbs (coal)
Power sourcesteam
Estimated power335 hp (250 kW)
Optimal speed19 mph
Top speed40 mph
Starting effort11,234 lbf
Power Plant
Driver diameter49.2 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 13 3/4 x 19 11/16 in
Grate area13.1 sq ft
Evaporative heating area791.8 sq ft
Total heating area791.8 sq ft
Calculated Values
steam locomotive
secondary line
tank locomotive
last changed: 08 2023

We use cookies to save the following settings:

  • selected navigation structure
  • selected language
  • preferred units
  • spelling of railway company names

If you refuse the use of cookies, the settings will only be retained for the current session and will be reset to the default values the next time you visit the site.

Display of units

Here you can set the desired unit system for the technical data.

  • Metric: Lengths in meters, weights in tonnes, and volumes in cubic meters
  • Imperial (UK): Lengths in feet/inches, weights in long tons and volumes in imperial gallons
  • Imperial (US): Lengths in feet/inches, weights in pounds, and volumes in US gallons
  • Individual: Depends on the country of origin of each locomotive
Operator names

Here you can set the display of railway company names.

  • Short: Abbreviation or short form of the name
  • Standard: commonly used name, partially translated to English
  • Complete: full name in local language