Selecting the Right Sound for your Diesel Locomotive

If you don’t know the particular prime mover and proper airhorn(s) for a specific locomotive, the task of choosing the correct diesel Tsunami2 can seem confusing. While we cannot tell you exactly which horn was used on a given locomotive on a particular day in history, we can help narrow your choices to those that were most commonly used by a particular road. Keep in mind that many of our prime movers are available in multiple decoder formats.


Selecting the Prime Mover

The term prime mover refers to the diesel engine that is found in each locomotive. Tsunami2 is available with the most common prime movers found on many diesel locomotives. Although different locomotive designs may have the same prime mover, they may produce slightly different sounds. These differences are due to how the prime mover is mounted and how the exhaust manifold is set up. To accommodate this, Tsunami2 has a 7-band equalizer that can be adjusted to make each locomotive have its own unique timbre.

Locomotives also differ in their gear ratio design. Some were designed with very low ratios for yard switching, while others had higher ratios for high-speed passenger train operations. Tsunami2 allows you to set the top speed and adjust how fast it reaches its highest notch through a user-adjustable speed curve and momentum CVs. Some locomotives contain two of the same prime movers. For example, the ALCO DH-643 has two 244 prime movers. To better accommodate this sound, you should consider adding a second speaker and boosting the equalizer's low-frequency volume.

Below is a list of prime movers and the product line to which they correspond. Select a prime mover from one of the charts below to see a list of specific locomotives that use that engine. Note that Econami Digital Sound Decoders have a more limited selection of prime movers than Tsunami2 does. If you cannot find your locomotive in the Econami selection consider Tsunami2 instead.

Prime Movers & Corresponding Models

EMD 567 No Transition
EMD 567 Non-Turbo
EMD 567D Turbo
EMD Dual 567
EMD 645 Non-Turbo
EMD 645 Turbo
EMD Dual 645 Turbo
EMD 710 Turbo
EMD 710G3C-T2

ALCO 539 Turbo
ALCO 539 Non-Turbo
ALCO 244
ALCO 251 i6
ALCO 251 v12
ALCO 251 v12 SC
ALCO 251C v16
ALCO 251C v16 SC

GE FDL-12
GE FDL-16
GE 7FDL-16
GE Dual FDL-16
GE GEVO "Evolution" Series
GE 44-Ton Cat
GE "Cummins" Diesel

Baldwin VO
Baldwin 608NA
Baldwin 608A
Baldwin 606NA
Galloping Goose
Dual Whitcomb
Fairbanks-Morse

Prime Movers & Corresponding Models

EMD 567 Non-Turbo
EMD 645 Turbo
EMD 710 Turbo

ALCO 244

GE FDL-16

 




EMD 567 (1st generation, no transition)
Switchers   
NW2 SW1 TR1 GMD1
NW3 SW7 TR2  
NW5 SW8 TR3
  SW9 TR4
  SW600 TR5
  SW900 TR6
  SW1200
EMD 567 Non-Turbo (1st generation)
F-Units "Geeps" SDs Switchers
FT CF7 GP7 SD7 BL1
F3 F9 GP9 SD9 BL2
F7 FP9 GP18  
FP7 FL9 GP28  
EMD 567D Turbo (1st generation)
"Geeps" SDs 8-Axle Units
GP20 SD24 DD35*
GP30 SD26 DD35A*
GP35 SD35

*DD35 series locomotives were equipped with two prime movers; we recommend adding a second speaker for further realism if space allows in your particular model.

EMD Dual 567 (1st generation, non-turbo)
E-Units  
E3 E5 E7 E9
E4 E6 E8  
EMD 645 Non-Turbo (2nd generation)
"Geeps"SDs Switchers
GP15-1 GP38AC SD38 SW1000 MP15
GP38     SW1500 MP15AC
GP38-2     SW1504
EMD 645 Turbo (2nd generation)
F-Units "Geeps" SDs
FP40 GP40 GP50 SD39 SDP45
F40PH GP40-2 GP15T SD40  SD40T-2
FP45 GP40TC GP49 SD40-2  SDL39
F45 GP40P GP50 SD45  SDL45-2
  GP40P-2   SD50 SD45X
  GP40X   SDP40 SD45-2
EMD Dual 645 Turbo (2nd generation)
8-Axle Units   
DDA40X     
EMD 710 Turbo (3rd generation)
F-Units "Geeps" SDs
F59PH GP59 SD60 SD70M
F59PHI GP60 SD60F SD70MAC
F69PH-AC GP60B SD60M SD90
  SD60MAC SD90M
  SD70 SD90MAC
EMD 710G3C-T2 (3rd generation)
SDs
SD70ACe SD70M-2



ALCO 539 Turbo
Cab Units Road Switchers Switchers
DL-105 RS-1 HH-900S-4
DL-107 RSD-1 HH-1000 S-12**
DL-109 S-2
DL-110 S-2

**The S-12 was built by Montreal Locomotive Works, which took over production of ALCO locomotives and prime movers in 1970.

ALCO 539 Non-Turbo
Cab Units Road Switchers Switchers
HH-660 RSC-13** S-1 S-10**
  S-3 S-11**

**The S-10, S-11, and RSC-13 were built by Montreal Locomotive Works, which took over production of ALCO locomotives and prime movers in 1970.

ALCO 244
Cab Units Road Switchers
FA-1 PB-1 RS-2 RS-10 RSD-7
FA-2 PA-2 RS-3RSD-4 RSC-3
FB-2 PB-2 RSC-2 RSD-5 RSC-24**
PA-1 RS-5 RS-4

**The RSC-24 was built by Montreal Locomotive Works, which took over production of ALCO locomotives and prime movers in 1970.

ALCO 251 i6
Switchers Road Switchers    
S-5 RSD-35 (Narrow Gauge WP&YR)
S-6 RS-23
S-13**  

**The S-13 was built by Montreal Locomotive Works, which took over production of ALCO locomotives and prime movers in 1970.

ALCO 251 v12
Cab Units Road Switchers "Century Series" Diesel-Hydraulic
FPA-4 RS-11 C-420 DH-643*
FPB-4 RS-18** M-420
  RS-36
  RSD-12

*DH-643 is equipped with two of the 251 12-cylinder prime movers; we recommend adding a second speaker for further realism if space allows in your particular model.

**The RS–18 was built by Montreal Locomotive Works, which took over production of ALCO locomotives and prime movers in 1970.

ALCO 251 v12 Super Charged
Road Switchers      
RS-32      
ALCO 251C v16
Road Switchers "Century Series"  
RS-27 C-424 C-855*  
RSD-15 C-425 C-855B*  
RSD-17 C-430    

*C-855 and C-855B locomotives contain two of the 16-cylinder 251 prime movers; we recommend adding a second speaker for further realism if space allows in your particular model.

ALCO 251C v16 Super Charged
"Century Series"      
M-630 M-636 C-630 C-636



GE FDL-12
GE "Universal Series" GE "Dash 7" Line GE "Dash 8" Line  
U23B B23-7 Dash 8-32B  
U23C BQ23-7 Dash 8-32C  
U26C (export) B30-7A P32-8WH  
  C30-7A P32AC-DM  
GE FDL-16
GE "Universal Series" GE "Dash 7" Line GE "Dash 8" Line GE Passenger
U25B B36-7 Dash 8-39B P30CH
U25C C30-7 Dash 8-39C U34CH
U28B C36-7 Dash 8-40B U30CG
U28C B30-7 Dash 8-40BW U28CG
U30B Dash 8-40C U36CG
U30C Dash 8-40CW  
U33B Dash 8-40CM  
U33C Dash 8-41CW  
U36B Dash 8-44CW  
U36C    
GE 7FDL-16
GE "AC" GE "Dash 9" Line GE "Genesis" Series  
AC4400CW Dash 9-40C P40DC  
AC6000CW Dash 9-40CW P42DC  
  Dash 9-44CW    
GE Dual FDL-16
U50
GE GEVO G12 “Evolution” Series
“Evolution” Series
ES40DC ES44DC ET44AC
ES44AC ES44C4 ET44C4
GE 44-Ton Center Cab Dual Caterpillar
45-Tonner Light Dual Engine Industrial Switchers
GE "Cummins" Diesel
70-Tonner Light Single Engine Industrial Switchers Diesel Rail Cars



Baldwin VO
Switchers 
VO-660VO-1000
Baldwin 608NA
Switchers Road Units
DS-4-4-1000 DR-6-4-2000* DT-6-6-2000*

*DR-6-4-2000 and DT-6-6-2000 locomotives contain two of the 608NA prime movers; we recommend adding a second speaker for further realism if space allows in your particular model.

Baldwin 608A
SwitchersRoad UnitsCab Units
DS-4-4-1000*DT-6-6-2000*DR-12-8-1500 “Centipede”***
S-12**DRS-6-4-1000*DR-6-4-2000 “Sharknose”*
DRS-4-4-1000*DR-6-2-1000*
RS-12**DR-6-2-1500#
DRS-6-4-1500***DR-4-4-1500 “Babyface”***
AS-416RF-16 “Sharknose”
DRS-4-4-1500***DR-4-4-1500 “Sharknose”***
AS-16
DRS-6-6-1500***
AS-616

*These units were built with a 606SC prime mover that sounds similar to the 608A.

**The S-12 and RS-12 were built with a 606A prime mover that sounds similar to the 608A.

***These units were built with a 608SC prime mover that sounds similar to the 608A.

Baldwin 606NA
Switchers Road Units
DS-4-4-660 DRS-6-4-660NA
DS-4-4-750 DRS-6-4-750
S-8



Rio Grande Southern Galloping Goose
RGS Geese 1-7 Other Light Industrial Locomotives
Gas Engine Rail Bus  



Dual Whitcomb
44-Ton Center Cab Other Light Industrial Locomotives
50-Ton Center Cab  
65-Ton Center Cab  
70-Ton Center Cab
80-Ton Center Cab



Fairbanks-Morse
Switchers & Road Switchers "C-Liners" Cab Units
H-10-44 H-16-44 CFA-16-4 CPB-16-4 P12-42
H-12-44 H-16-66 CFB-16-4 CPA-16-5 "Erie Built"
H-12-44TS H-20-44 CFA-20-4 CPB-16-5
H-12-46 H-24-66 CFB-20-4 CPB-20-5
H-15-44 CPA-16-4 CPA-24-5