Norfolk Southern Locomotive Spotting Guide

EMD Model Designation

Example: SD  70        AC

If last digit is 9, then 12 cylinder prime mover; otherwise 16 cylinder.

Exception: T4 locos are 12 cylinders always

(blank) = base version

-1 = EMD reman. program (late 1960s)

-2 EMD reliability improvement series

A = Special Custom Builds
AC = Alternator or AC Traction
M or W = Wide cab
I = Isolated (vibration reducing wide cab)
L = Lightweight frame
P = Passenger/steam heat
H = Head End Power (HEP)
e = Reduced emissions compliant
-T4 = Tier 4 emissions compliant
IAC = Individual Axle Control
P4 [?] = B1-1B wheel arrangement
X = Experimental

GE Model Designation

Example: Dash9  44 C  W

U = Universal
P = Passenger
Dash8 = Dash 8 Series
Dash9 = Dash 9 Series
AC = AC Traction Series
ES = Evolation Series
ET = Evolution Series, T4 Compliant

C = Cowl Unit
H = Head End Power (HEP)
P = Passenger
Q = Extended Crew Cab
W = Wide Cab

Round One:

Brake Reservoir: Two tanks

GE

EMD

Round Two:

Radiator "winged" (except U-boats)

GEVO has mini-radiator in front of main radiator

GEVO T-4 similar to standard GEVO radiator but massive 

• Two large fans - 38 series
• Three large fans - 40 series
• Three large fans, angled radiator - 45 series
• Three large fans, tall radiator screens - 50/60 series
• Three large fans, tall angled radiator - 70 series
• Three large fans, chunky angled radiator - 80/90 series
• Two XL fans, chunky angled radiator - 80/90 series (Ace)
• Three XL fans, chunky angled radiator - 80/90 series (Ace T-4)

Fan Size: Large = 48"; XL = 54"

more to come