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Appropriate Tsunamis for SP Cab Forwards: April 6, 2007

Posted by on Jan 16, 2014 in Locomotives, Tony's Tips | 0 comments

Bob Liberman, an avid SP modeler shows the correct Soundtraxx Tsunamis to use for the different Cab-Forward configurations.

Choosing the Appropriate Tsunami for your Southern Pacific Cab-Forward*
Two Different Air Pump Configurations produced Noticeably Different Sounds!

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The Soundtraxx Tsunami decoder 826105 is made specifically for the Southern Pacific Cab-Forwards that have their air pumps located on the back end of the boiler between the engine and tender.

The Broadway Limited AC-4&5 Cab-Forward have the air pumps located on the right side of the locomotive and the air pump exhaust pipes run through the exhaust stack. Use the Soundtraxx 826103 Heavy Steam.

spcabbfwd_03

 

Picture one shows the second Cab-Forward with air pump stacks that went directly to the outside to the air and were not muffled by the boiler. Picture two is a close up of the exhaust pipes from the air pumps.

AC-4 4100 to 4109 ———– Use the Tsunami Heavy Steam Decoder, 826103
AC-5 4110 to 4125 ———– Use the Tsunami Heavy Steam Decoder, 826103
AC-6 4126 to 4150 ———– Use the Tsunami Cab-Forward Decoder (no air horn), 826105
AC-7 4161 to 4176 ———– Use the Tsunami Cab-Forward Decoder (no air horn), 826105
AC-8 4177 to 4204 ———– Use the Tsunami Cab-Forward Decoder (air horn), 826105
AC-9 3800 to 3811 ———– Use the Tsunami Cab-Forward Decoder (air horn), 826105
AC-10 4205 to 4244———- Use the Tsunami Cab-Forward Decoder (air horn), 826105
AC-11 4245 to 4274 ——— Use the Tsunami Cab-Forward Decoder (air horn), 826105
AC-12 4275 to 4294 ——— Use the Tsunami Cab-Forward Decoder (air horn), 826105

All are Cab-Forwards except the AC-9 which was built as a conventional engine for the Rio Grand Division and were built as coal burners and converted to oil in 1950.

The AC-6 was the first engine to have the air pumps on the boiler back. This locomotive was the same configuration as the AC- 4&5.

*Courtesy of Bob Liberman

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