What does Solingen Steel do in AoE3?

Doppelsoldner: hit points +50%, damage +50%, speed −33%; Ships 4 Uhlan. The game says: "Doppelsoldner attack and hitpoints increase greatly, but speed drops drastically."

Home City card

Solingen Steel

Solingen Steel (tech ID HCXPSolingenSteel) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Doppelsoldner: hit points +50%, damage +50%, speed −33%; Ships 4 Uhlan. It hands over about 600 resources' worth.

Quick answers (3)

Which civilizations have the Solingen Steel card?: Germans.
What does Solingen Steel do in AoE3?: Doppelsoldner: hit points +50%, damage +50%, speed −33%; Ships 4 Uhlan. The game says: "Doppelsoldner attack and hitpoints increase greatly, but speed drops drastically."
What is the tech ID of Solingen Steel?: HCXPSolingenSteel.

Doppelsoldner attack and hitpoints increase greatly, but speed drops drastically.

What it does

Doppelsoldner: hit points +50%, damage +50%, speed −33%
Ships 4 Uhlan(unit)

What it hands over

4 × Uhlan150 each

Total ≈ 600 resources — units at their train cost, crates and animals at what they hold.

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

In these decks

GermansIV×1

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