Hello,
I have all the HD Age mods installed, however with this one activated my elevated rails have a yellow tint underneath them.
I created a new game with just this mod (and space age + elevated rails) activated and still have this issue.

Without HD Mod: https://cdn.discordapp.com/attachments/1184612830054457417/1325150859885150208/Screenshot_2025-01-04_at_9.16.05_AM.png?ex=677abe69&is=67796ce9&hm=ffa5bedfed1da81db9be5f4f678fc5736adea0c7ba5e36b91e80c4e8f336dd99&

With HD Mod: https://cdn.discordapp.com/attachments/1184612830054457417/1325150909348712578/Screenshot_2025-01-04_at_9.13.59_AM.png?ex=677abe74&is=67796cf4&hm=3d476b8934008ed91253c9126e4fcda343f6b3ee42690129243537b014465b6f&

Hello,
that's strange, I definitely didn't set a tint layer and nothing like that happened in my tests. Can you please tell me what system (Windows, Linux or Mac) you are playing on and what graphics card you have in your system. If you have an Nvidia card, I would also be interested in the driver version.

I am running this on a 14 inch M2 MacBook Pro.
I just upgraded to Sequoia, but it was happening on Sonoma as well.

Here is the output from my system report:
Chipset Model: Apple M2 Max
Type: GPU
Bus: Built-In
Total Number of Cores: 30
Vendor: Apple (0x106b)
Metal Support: Metal 3
Displays:
Color LCD:
Display Type: Built-in Liquid Retina XDR Display
Resolution: 3024 x 1964 Retina
Main Display: Yes
Mirror: Off
Online: Yes
Automatically Adjust Brightness: Yes
Connection Type: Internal

That makes things a lot more complicated because I can't recreate it. The first thing that comes to my mind is that Mac only works with OpenGL and not with DirectX11 or 12.

Could you please start the game once, open the savegame with which you created the screnschots, then close everything again. After that you will find under

~/Library/Application Support/Steam/steamapps/common/Factorio/factorio.app/Contents/Applications/factorio.app/Contents

or

~/Library/Application Support/factorio

the factorio-current.log file which you then link here please.

0.000 2025-01-04 15:47:39; Factorio 2.0.28 (build 81088, mac-arm64, steam, space-age)
0.000 Operating system: macOS 15.2.0
0.000 Initializing Steam API.
0.000 Program arguments: "/Users/drwifi/Library/Application Support/Steam/steamapps/common/Factorio/factorio.app/Contents/MacOS/factorio"
0.000 Config path: /Users/drwifi/Library/Application Support/factorio/config/config.ini
0.000 Read data path: /Users/drwifi/Library/Application Support/Steam/steamapps/common/Factorio/factorio.app/Contents/data
0.000 Write data path: /Users/drwifi/Library/Application Support/factorio [365103/948584MB]
0.000 Binaries path: /Users/drwifi/Library/Application Support/Steam/steamapps/common/Factorio/factorio.app/Contents
0.041 System info: [CPU: arm64, 12 cores, RAM: 65536 MB]
0.383 Display options: [FullScreen: false] [VSync: true] [UIScale: automatic (100.0%)] [Native DPI: true] [Screen: 255] [Special: lmW] [Lang: en]
0.606 Video driver: cocoa
0.606 Available displays: 1
0.606 [0]: 0 - {[0,0], 1800x1169, SDL_PIXELFORMAT_ARGB8888, 120Hz, 0x0001(0x01)}
0.624 Initialised OpenGL:[0] Apple M2 Max; driver: 4.1 Metal - 89.3
0.624 [Size] Window: 1800x1097, Backbuffer: 3600x2194
0.624 [Extensions] s3tc:yes; KHR_debug:NO; ARB_clear_texture:NO, ARB_copy_image:NO, ARB_pipeline_statistics_query:NO, ARB_gl_spirv:NO, ARB_ES2_compatibility:yes
0.624 [Version] 4.1
0.624 Graphics settings preset: very-high
0.624 Dedicated video memory size 49152 MB (detected from Apple M2 Max; VendorID: 0x1027f00)
0.630 Graphics options: [Graphics quality: high] [Video memory usage: all] [DXT: high-quality]
0.630 [Max threads (load/render): 32/12] [Max texture size: 0] [Tex.Stream.: false] [Rotation quality: normal] [Other: STDCWTl] [B:0,C:0,S:100]
0.723 [Audio] Driver:coreaudio, Device:Default device, Depth:16, Frequency:44100, Channels:2, Interpolation:linear
1.181 Info ModManager.cpp:438: FeatureFlag expansion-shaders = true
1.181 Info ModManager.cpp:438: FeatureFlag freezing = true
1.181 Info ModManager.cpp:438: FeatureFlag quality = true
1.181 Info ModManager.cpp:438: FeatureFlag rail-bridges = true
1.181 Info ModManager.cpp:438: FeatureFlag segmented-units = true
1.181 Info ModManager.cpp:438: FeatureFlag space-travel = true
1.181 Info ModManager.cpp:438: FeatureFlag spoiling = true
1.306 Loading mod core 0.0.0 (data.lua)
1.347 Loading mod base 2.0.28 (data.lua)
1.464 Loading mod elevated-rails 2.0.28 (data.lua)
1.487 Loading mod quality 2.0.28 (data.lua)
1.512 Loading mod factorio_hd_age_elevated_rails 1.0.3 (data.lua)
1.519 Loading mod space-age 2.0.28 (data.lua)
1.781 Loading mod base 2.0.28 (data-updates.lua)
1.789 Loading mod quality 2.0.28 (data-updates.lua)
1.800 Loading mod space-age 2.0.28 (data-updates.lua)
1.807 Loading mod factorio_hd_age_elevated_rails 1.0.3 (data-final-fixes.lua)
2.548 Checksum for core: 283742623
2.548 Checksum of base: 1505520187
2.548 Checksum of elevated-rails: 3624276517
2.548 Checksum of quality: 1945933776
2.548 Checksum of factorio_hd_age_elevated_rails: 2772850446
2.548 Checksum of space-age: 507955763
2.751 Prototype list checksum: 3777526167
2.793 Loading sounds...
3.223 Info PlayerData.cpp:68: Local player-data.json unavailable
3.223 Info PlayerData.cpp:71: Cloud player-data.json available, timestamp 1736034458
3.227 Post-data load graphics options: [Light occlusion: YES]
3.550 Initial atlas bitmap size is 16384
3.555 Created an atlas bitmap (size 16384x16336) [none]
3.558 Created an atlas bitmap (size 16384x15400) [none]
3.561 Created an atlas bitmap (size 16384x15400) [none]
3.565 Created an atlas bitmap (size 16384x15400) [none]
3.568 Created an atlas bitmap (size 16384x15400) [none]
3.571 Created an atlas bitmap (size 16384x16384) [none]
3.577 Created an atlas bitmap (size 16384x16376) [none]
3.588 Created an atlas bitmap (size 16384x16384) [none]
3.594 Created an atlas bitmap (size 16384x16384) [none]
3.595 Created an atlas bitmap (size 16384x15968) [none]
3.596 Created an atlas bitmap (size 16384x16380) [none]
3.599 Created an atlas bitmap (size 16384x16376) [none]
3.599 Created an atlas bitmap (size 16384x5568) [none]
3.599 Created an atlas bitmap (size 16384x10324) [decal]
3.601 Created an atlas bitmap (size 16384x16320) [low-object]
3.601 Created an atlas bitmap (size 8192x5760) [low-object]
3.601 Created an atlas bitmap (size 16384x13472) [corpse-decay]
3.601 Created an atlas bitmap (size 16384x5580) [none]
3.601 Created an atlas bitmap (size 1676x79) [not-compressed]
3.601 Created an atlas bitmap (size 16384x4032) [mipmap, linear-minification, linear-magnification, linear-mip-level]
3.604 Created an atlas bitmap (size 16384x16352) [terrain, mipmap, linear-minification, linear-mip-level]
3.604 Created an atlas bitmap (size 16384x4944) [terrain, mipmap, linear-minification, linear-mip-level]
3.604 Created an atlas bitmap (size 8192x3888) [terrain-effect-map, mipmap, linear-minification, linear-mip-level]
3.604 Created an atlas bitmap (size 4096x3088) [smoke, mipmap, linear-minification, linear-magnification]
3.604 Created an atlas bitmap (size 8192x2576) [mipmap]
3.604 Created an atlas bitmap (size 2048x1520) [mipmap]
3.604 Created an atlas bitmap (size 4096x3152) [mipmap]
3.604 Created an atlas bitmap (size 4096x3152) [mipmap]
3.604 Created an atlas bitmap (size 4096x3152) [mipmap]
3.604 Created an atlas bitmap (size 8192x3808) [icon, not-compressed, mipmap, linear-minification, linear-magnification, linear-mip-level]
3.604 Created an atlas bitmap (size 16384x6120) [alpha-mask]
3.616 Created an atlas bitmap (size 16384x16384) [shadow, linear-magnification, alpha-mask]
3.618 Created an atlas bitmap (size 16384x16384) [shadow, linear-magnification, alpha-mask]
3.618 Created an atlas bitmap (size 16384x10328) [shadow, linear-magnification, alpha-mask]
3.619 Created an atlas bitmap (size 8192x3952) [shadow, mipmap, linear-magnification, alpha-mask]
3.619 Created an atlas bitmap (size 2048x496) [icon-background, not-compressed, mipmap, linear-minification, linear-magnification, linear-mip-level, ]
3.619 Loading 3D bitmaps.
3.633 Texture processor created (2048). GPU accelerated compression Supported: yes, Enabled: yes/yes. Test passed. YCoCgDXT PSNR: 36.09, BC3 PSNR: 33.82
3.638 Parallel sprite loader initialized (threads: 11, bitmaps: 9053)
27.328 Sprites loaded
27.344 Generated mipmaps (4) for atlas [14] of size 16384x16320
27.350 Generated mipmaps (4) for atlas [15] of size 8192x5760
27.353 Generated mipmaps (3) for atlas [19] of size 16384x4032
27.362 Generated mipmaps (3) for atlas [20] of size 16384x16352
27.368 Generated mipmaps (3) for atlas [21] of size 16384x4944
27.370 Generated mipmaps (3) for atlas [22] of size 8192x3888
27.371 Generated mipmaps (3) for atlas [23] of size 4096x3088
27.413 Generated mipmaps (3) for atlas [24] of size 8192x2576
27.415 Generated mipmaps (3) for atlas [25] of size 2048x1520
27.417 Generated mipmaps (3) for atlas [26] of size 4096x3152
27.440 Generated mipmaps (3) for atlas [27] of size 4096x3152
27.449 Generated mipmaps (3) for atlas [28] of size 4096x3152
27.472 Generated mipmaps (5) for atlas [29] of size 8192x3808
27.475 Generated mipmaps (3) for atlas [34] of size 8192x3952
27.482 Custom mipmaps uploaded (3189)
27.495 Video memory usage: 6843.57 MB (Atlases: 6713.26 MB, Textures: 130.30 MB)
27.551 Factorio initialised
27.553 Steam Storage Quota: 23613/23841
33.132 Loading map /Users/drwifi/Library/Application Support/factorio/saves/Rail Test.zip: 2411119 bytes.
33.158 Loading level.dat: 2992555 bytes.
33.162 Info Scenario.cpp:178: Map version 2.0.28-1
33.233 Loading blueprint storage: Local timestamp 1735781479, Cloud timestamp 1735781478
33.306 Loading script.dat: 1222 bytes.
33.308 Checksum for script level/control.lua: 2824674896
41.620 Info AppManager.cpp:342: Deleting active scenario.
42.951 Quitting: user-quit.
43.270 Steam API shutdown.
43.273 Goodbye

Please let me know if this bug still exists, I just updated a lot of mods including the elevated rails.

Unfortunately the yellow still exists when the mod is enabled.

Do you know a little bit about programming, and would you trust yourself to change a few things in my files to find out what the problem is?

I have gone into mods to change some settings, if you can point me to the area you want to test I can do it

First, I want to find out which layer of the textures is causing the problem.
I would ask you to comment out sections of the elevated-rail.lua file. To do this, you need to put two dashes in front of each line.
You can see the first two sections marked in the following picture.

Screenshot.png

Please comment out only one single section at a time, save the file and test again to see if the tint disappears.
Of course, it could also be due to several layers, in which case the tint would become lighter.
It may happen that parts of the tracks themselves are no longer displayed, but this is irrelevant, it is only about the tint.

Ok, I’ll try that later today

So, commenting out backplates, ties, and stone_paths create the lightest tint https://cdn.discordapp.com/attachments/536449239610294304/1325644650098462740/Screenshot_2025-01-05_at_5.49.47_PM.png?ex=677c8a49&is=677b38c9&hm=631f7082977096aee0c8e52020cdf46c43bff76d74750ecdb6ba11d5c9fe0c34&

Trying to comment out the Railings or layers sections throws an error on game load.

So there are several levels involved.

But now comes the point where I don't really know what to do.
First the textures were created in the same way as for the normal tracks, but there is no tint there. --> This tells me that the image files are fine.
Secondly, I do not use a command for a tint.
Finally, I can't find any of the possible commands that I think might have an effect on the phenomenon.

I'm going to think about it for a couple of days and maybe I'll come up with a different idea.

possibly related: https://forums.factorio.com/116387

@DrWiFi
Could the Factorio update (version 2.0.34 or higher) solve your problem?