What does Knox Artillery Train do in AoE3?

Gives: Heavy Horse Guns; Horse Artillery: hit points +20%, train time −20%; Heavy Cannon: hit points +20%, train time −10%. The game says: "Upgrades Horse Artillery to Heavy Horse Guns. Horse Artillery and Heavy Cannons have more hit points and are trained faster."

Home City card

Knox Artillery Train

Knox Artillery Train (tech ID DEHCKnoxArtilleryTrain) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Gives: Heavy Horse Guns; Horse Artillery: hit points +20%, train time −20%; Heavy Cannon: hit points +20%, train time −10%.

Quick answers (3)

Which civilizations have the Knox Artillery Train card?: United States.
What does Knox Artillery Train do in AoE3?: Gives: Heavy Horse Guns; Horse Artillery: hit points +20%, train time −20%; Heavy Cannon: hit points +20%, train time −10%. The game says: "Upgrades Horse Artillery to Heavy Horse Guns. Horse Artillery and Heavy Cannons have more hit points and are trained faster."
What is the tech ID of Knox Artillery Train?: DEHCKnoxArtilleryTrain.

Upgrades Horse Artillery to Heavy Horse Guns. Horse Artillery and Heavy Cannons have more hit points and are trained faster.

What it does

Gives: Heavy Horse Guns
Horse Artillery: hit points +20%, train time −20%
Heavy Cannon: hit points +20%, train time −10%

Cost: 1
Sent from: IV
Times it can be sent: 1
Game ID: DEHCKnoxArtilleryTrain

In these decks

United StatesIV×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).