I'm attempting to make a custom tech tree for Terrans, mainly with the engines being available in a different order. The header looks like this.

</Propulsion>
 <Propulsion ID="Terran Warp Drive">
        <DisplayName>Terran Warp Drive</DisplayName>

My problem occurs when after I research my Terran tech the engine will not show up in game. Now I can get it to show up if I make the file look like this.

</Propulsion>
 <Propulsion ID="Warp Drive">
        <DisplayName>Terran Warp Drive</DisplayName>

But the game then overwrites the original warp drive thus making the changes pointless and the tech tree very odd looking. Is there a way around this? FYI I'm using DL only and I'm editing the files in the data/english folder not under mods, just incase that affects anything.