RedMaxBR

I recreated Casa Madrugada with the map editor
,You will need lml to load the map
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com
 

This mod add a railroad in Mexico as well as in rdr1(this will not add trains running there)
Until now i will not put the bridges, maybe in the future
it is necessary to use the lml
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com
butter bridge: Butter Bridge - Maps - RDR2Mods.com
frontera bridge: Frontera Bridge - Maps - RDR2Mods.com
Video about the mod: RailRoad on mexico is finished (RDR2 MAP MOD) - YouTube

I recreating Escalera with the map editor
You will need lml to load the map
Its not finished YET, missing the mansion and the prison
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com

This mod add El Matadero as well as in rdr1
it is necessary to use the lml
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com

I recreated chuparosa with the map editor
you will need lml to load the map)
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com
YouTube video about the map: Chuparosa on rdr2 (MOD) - YouTube

I tried to recreate MacFarlane's Barn with Map Editor
You will need lml to load the map
The barn doesn't have an interior, the colors don't look like the Original but that's what I managed to do with the map editor.
LML:
 

I recreated Butter Bridge on rdr2 with the map editor
,You will need lml to load the map and Red Dead Beta - Out of Bounds to remove invincible barriers
I will make Railroad on Mexico compatible with this bridge soon
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com
RDB out of bounds: Red Dead Beta - Out of Bounds at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)

I recreated Widow's Patch(rdrevolver) with the map editor 
You will need lml to load the map and Red Dead Beta - Out of Bounds to remove invincible barriers
I had to make the city south of mexico, since north of new austin i didn't find any flat terrain to make the city
I left some phone/electric pole and a "bridge" that will take you to the city, if you want to teleport there the coordinates are:
x-1602.153 y-5061.419 z-82.013
RD Beta: Red Dead Beta - Out of Bounds at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
LML:
 

I recreated Sepulcro, Campo Mirada,Barranca,Rancho Polvo with the map editor
,You will need lml to load the map
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com

I've added some details that make the towns have a UN look
I will add more details on roads and some other locations on the map
I removed most of the peds and I also made the weather just between misty, fog, thunderstorm and shower
This mod will conflict with other mods that use ambientpedmodelsets.meta only Ambient Gangs will be compatible
I recommend you to use the rampage trainer to turn on halloween overwide to make the weather similar to the screenshoots and rdr un soundtrack
You will need lml to load the files
LML: 
 
RDR UN soundtrack:
 
Rampage trainer:  Rampage Trainer at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
Undead Blackwater: Undead Blackwater at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
Manzanita post: Manzanita Post RDR1 at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)

To use this mod you will need to download the Red dead radio mod
link: Red Dead Radio 0.9.9 at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
Remembering that this will not replace the standard soundtrack of the game, you will only have an mp3 player within the game that you can play the songs from the rdr1 undead nightmare.
To install you need to place the files inside the mod's Radios at: Red Dead Redemption 2 \ Red Dead Radio
When you install you just need to press Q + R to open the Radio inside the game and select the radio and soundtrack you want to use.

I have set up campsites around nuevo paraiso, in case you want to sleep or use the fire.
You will need lml to load the map
I left their locations in the images above
I recommend you to use mexico on mini map
Mexico on mini map: Mexico on Minimap at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com

I am trying to recreate tumbleweed from 1911, the town is not destroyed at the moment, I removed the peds and placed some objects in the town
(some peds appear in the saloon and the sheriff too)
this mod may crash with other mods that use ambientpedmodelsets.meta and popgroups.ymt
You will need LML
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com

To use this mod you will need to download the Red dead radio mod
link: Red Dead Radio 0.9.9 at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
Remembering that this will not replace the standard soundtrack of the game, you will only have an mp3 player within the game that you can play the songs from the first redemption.
To install you need to place the files inside the mod's Radios at: Red Dead Redemption 2 \ Red Dead Radio
When you install you just need to press Q + R to open the Radio inside the game and select the radio and soundtrack you want to use.
Remembering that I didn't make the mod I just separated the soundtrack from rdr1 all the work was done by kostas96b.
You can find the rdr undead nightmare and red dead revolver soundtrack here: Red Dead Redemption Undead Nightmare SoundTrack at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com) Red Dead Revolver soundtrack at Red Dead Redemption 2 Nexus - Mods and community (nexusmods.com)
You can find the tutorial here: How to install Red dead radio and rdr1 soundtrack for Red Dead Redemption 2 - YouTube

I recreated Tanner's Span with the map editor
Tanner's span is located northeast of MacFarlane's Ranch, It is a railroad bridge that connects Hennigan's Stead to Tall Trees west of the Pacific Union Railroad Camp.
You will need the lml and the Great Plains Railway map
LML: Lenny's Mod Loader RDR - Tools - RDR2Mods.com
Great Plains RailWay: Great Plains Railway - Maps - RDR2Mods.com