Florida East Coast 4-4-2 "Atlantic" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 45 (Locobase 6673)

Data from FEC 1926 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Thanks to Chris Hohl for his 20 January 2018 email overcoming a smudged diagram and using logic to calculate the tender's loaded weight and for reporting the correct driver diameter.) Works numbers were 28412-28421, 31240-31244, and 39047-39051 on locomotives that were delivered in 1904-1905.

These low-drivered Atlantics constituted a surprisingly numerous class. They were an odd breed -- the builder doesn't seem to have exploited the addition of a trailing axle to enlarge the grate or firebox area by much. Chris Hohl reported in his 20 January 2018 close reading of the FEC diagram that some of the class burned coal and trailed tenders carrying 9 1/2 tons (8.6 metric tonnes).

The class was disposed of between 1923-1930.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6673
RailroadFlorida East Coast
Number in Class20
Road Numbers45-64
Number Built20
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)25.92 / 7.90
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender) (ft / m)50.23 / 15.31
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)81,000 / 36,741
Engine Weight (lbs / kg)151,000 / 68,493
Tender Loaded Weight (lbs / kg)111,000 / 50,349
Total Engine and Tender Weight (lbs / kg)262,000 / 118,842
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2400 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)68 / 34
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)68 / 1727
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)21,119 / 9579.43
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84
Heating Ability
Firebox Area (sq ft / m2)134.80 / 12.52
Grate Area (sq ft / m2)37.73 / 3.51
Evaporative Heating Surface (sq ft / m2)2285 / 212.28
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2285 / 212.28
Evaporative Heating Surface/Cylinder Volume267.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6791
Same as above plus superheater percentage6791
Same as above but substitute firebox area for grate area24,264
Power L17075
Power MT385.13

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