ALCODiesel-electric
ALCO PA
- Power
- 2,000–2,250 hp
- Wheel arrangement
- A1A-A1A
- Era
- 1946–1953
- Role
- Passenger
Streamlined cab unit
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EMDDiesel-electric
EMD F7
- Power
- 1,500 hp
- Wheel arrangement
- B-B
- Era
- 1949–1953
- Role
- Freight / Passenger
Cab unit
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EMD GP9
- Power
- 1,750 hp
- Wheel arrangement
- B-B
- Era
- 1954–1963
- Role
- Road switcher
Road switcher
Open full profile →EMDDiesel-electric
EMD GP38-2
- Power
- 2,000 hp
- Wheel arrangement
- B-B
- Era
- 1972–1986
- Role
- Road switcher
Road switcher
Open full profile →EMDDiesel-electric
EMD SD40-2
- Power
- 3,000 hp
- Wheel arrangement
- C-C
- Era
- 1972–1989
- Role
- Freight
Road freight
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EMD SD70ACe
- Power
- 4,300 hp
- Wheel arrangement
- C-C
- Era
- 2000s–present family
- Role
- Heavy freight
AC road freight
Open full profile →GEDiesel-electric
GE AC4400CW
- Power
- 4,400 hp
- Wheel arrangement
- C-C
- Era
- 1993–2004
- Role
- Heavy freight
AC road freight
Open full profile →GEDiesel-electric
GE ES44AC
- Power
- 4,400 hp
- Wheel arrangement
- C-C
- Era
- 2000s–2010s
- Role
- Heavy freight
GEVO road freight
Open full profile →ALCOSteam
Union Pacific Big Boy No. 4014
- Power
- Steam — varies with speed
- Wheel arrangement
- 4-8-8-4
- Era
- Built 1941; restored to operation 2019
- Role
- Heavy freight / Excursion
Articulated steam
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1. Start with the body
Cab unit, road switcher, wide-nose freight locomotive, articulated steam locomotive—overall shape narrows the field quickly.
2. Count axles and trucks
B-B diesels have two two-axle trucks; C-C diesels have two three-axle trucks. Steam locomotives use wheel-arrangement notation such as 4-8-8-4.
3. Look for spotting details
Radiator shape, dynamic-brake housing, cab design, hood proportions and builder-specific details help distinguish similar models.
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