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Description
Created this out of inspiration, that what if Mack had two extra tenders instead of the one coal-and-water and two extra water tenders, and instead you can couple up to two of these experimental tenders.

The condensing tender was used primarily for the South African, and is not very successful. This tender gathers carbon dioxide and condenses back to water for extra use.

The rocket booster tender has an unusual purpose. If you have a heavy and long freight train having trouble up steep mountains and grades, this can be coupled to the very back of the train that will help you boost it forward, depending on the entire weight of the train.

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Credit to JasonSembrano2000

Description
Created this out of inspiration, that what if Mack had two extra tenders instead of the one coal-and-water and two extra water tenders, and instead you can couple up to two of these experimental tenders.

The condensing tender was used primarily for the South African, and is not very successful. This tender gathers carbon dioxide and condenses back to water for extra use.

The rocket booster tender has an unusual purpose. If you have a heavy and long freight train having trouble up steep mountains and grades, this can be coupled to the very back of the train that will help you boost it forward, depending on the entire weight of the train.

-----------------------------------------------------------------

Credit to JasonSembrano2000