It appears IR and MTS (Minecraft Transport Simulator) are incompatible. I cannot send you a crash report because MC does not appear to save one when such a crash occurs: being every time they launch together.

send your latest.log instead.

Have you tried updating MTS to Immersive Vehicles? I think the mod is under that name now.

It is the latest version; I just slip between names sometimes.

Also, it appears to have a problem with my entire mod list now, being:

BiblioCraft[v2.4.5][MC1.12.2]
BlackThorne+Empire+Vehicles+[MTS]+[IR]+1.10.2-14.0.0-1.5.0-1.11.2
Computronics-1.12.2-1.6.6
DimensionalDoors-3.0.9-287
Immersive+Vehicles+(IV)+Seagull's+civil+pack+1.21.0
Immersive+Vehicles+(IV)+Seagull's+military+pack+1.7.3
Immersive+Vehicles+(IV)+Seagull's+trin+parts+pack+1.11.2
Immersive+Vehicles-1.12.2-14.3.1
malisiscore-1.12.2-6.5.1
malisisdoors-1.12.2-7.3.0
Melvins_Simple_Sign_Pack-Beta-0.0.5
Merlyn's+Luxurious+Vehicles+Pack+5.4
Moonspire+Metropolitan+Motors+[MTS]+1.10.2-14.0.0-1.0.3
MTS_Caterpillar_Pack_V1.1.1
MTS_Heavy_Industrial_by_AdamRK_1.9.0
MTS_Official_Pack_V11
MTS_P1_airportpack
OpenBlocks-1.12.2-1.8.1
OpenModsLib-1.12.2-0.12.2
OpenSecurity-MC1.12.2-1.0-23
UNU+Parts+Pack+[MTS]+1.10.2-14.0.0-1.11.2
GalacticraftCore-1.12.2-4.0.2.210
Galacticraft-Planets-1.12.2-4.0.2.210
ImmersiveEngineering-0.12-89
ImmersiveRailroading-1.6.1_1.12-1138
MicdoodleCore-1.12.2-4.0.2.210
OpenComputers-MC1.12.2-1.7.4.153
OptiFine_1.12.2_HD_U_E3
TrackAPI-1.1_1.12

the contents of my latest.txt:

[11:28:02] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[11:28:02] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[11:28:02] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[11:28:02] [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2768 for Minecraft 1.12.2 loading
[11:28:02] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Program Files (x86)\Minecraft Launcher\runtime\jre-x64
[11:28:02] [main/INFO] [FML]: Searching C:\Users<censored>\AppData\Roaming.minecraft\versions\1.12.2-forge1.12.2-14.23.5.2768\mods for mods
[11:28:03] [main/WARN] [FML]: The coremod micdoodle8.mods.miccore.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[11:28:03] [main/WARN] [FML]: The coremod MicdoodlePlugin (micdoodle8.mods.miccore.MicdoodlePlugin) is not signed!
[11:28:03] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in OpenComputers-MC1.12.2-1.7.4.153.jar. This is not recommended, @mods should be in a separate jar from the coremod.
[11:28:03] [main/WARN] [FML]: The coremod li.cil.oc.common.launch.TransformerLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[11:28:03] [main/WARN] [FML]: The coremod TransformerLoader (li.cil.oc.common.launch.TransformerLoader) is not signed!
[11:28:03] [main/INFO] [FML]: Loading tweaker optifine.OptiFineForgeTweaker from OptiFine_1.12.2_HD_U_E3.jar
[11:28:03] [main/WARN] [FML]: The coremod blusunrize.immersiveengineering.common.asm.IELoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[11:28:03] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[11:28:03] [main/INFO] [LaunchWrapper]: Loading tweak class name optifine.OptiFineForgeTweaker
[11:28:03] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[11:28:03] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[11:28:03] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[11:28:03] [main/INFO] [LaunchWrapper]: Calling tweak class optifine.OptiFineForgeTweaker
[11:28:03] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: acceptOptions
[11:28:03] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: injectIntoClassLoader
[11:28:03] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:221]: OptiFine ClassTransformer
[11:28:03] [main/INFO] [STDOUT]: [optifine.OptiFineClassTransformer:dbg:221]: OptiFine ZIP file: C:\Users<censored>\AppData\Roaming.minecraft\versions\1.12.2-forge1.12.2-14.23.5.2768\mods\OptiFine_1.12.2_HD_U_E3.jar
[11:28:03] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[11:28:06] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[11:28:07] [main/INFO] [FML]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[11:28:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[11:28:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[11:28:07] [main/INFO] [STDOUT]: [micdoodle8.mods.miccore.MicdoodlePlugin:getASMTransformerClass:99]: Successfully Registered Transformer
[11:28:07] [main/INFO] [STDOUT]: [micdoodle8.mods.miccore.MicdoodlePlugin:injectData:292]: [Micdoodle8Core]: Patching game...
[11:28:07] [main/INFO] [STDOUT]: [micdoodle8.mods.miccore.MicdoodlePlugin:injectData:292]: [Micdoodle8Core]: Patching game...
[11:28:07] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[11:28:08] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[11:28:08] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[11:28:11] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[11:28:11] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[11:28:11] [main/INFO] [STDOUT]: [optifine.OptiFineForgeTweaker:dbg:56]: OptiFineForgeTweaker: getLaunchArguments
[11:28:11] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[11:28:14] [main/INFO] [net.minecraft.client.Minecraft]: Setting user:
[11:28:18] [main/INFO] [OpenComputers]: Successfully patched net/minecraft/entity/EntityLiving.recreateLeash.
[11:28:25] [main/INFO] [Config]: [OptiFine] *** Reflector Forge ***
[11:28:25] [main/INFO] [Config]: [OptiFine] (Reflector) Class not present: mods.betterfoliage.client.BetterFoliageClient
[11:28:27] [main/INFO] [Config]: [OptiFine] (Reflector) Method not present: net.minecraftforge.client.ForgeHooksClient.renderLitItem
[11:28:27] [main/INFO] [Config]: [OptiFine] (Reflector) Field not present: net.minecraftforge.common.ForgeModContainer.allowEmissiveItems
[11:28:27] [main/INFO] [Config]: [OptiFine] (Reflector) Method not present: net.minecraft.potion.Potion.renderHUDEffect
[11:28:28] [main/INFO] [Config]: [OptiFine] (Reflector) Method not present: net.minecraftforge.client.MinecraftForgeClient.getImageLayer
[11:28:28] [main/INFO] [Config]: [OptiFine] *** Reflector Vanilla ***
[11:28:28] [main/WARN] [net.minecraft.client.settings.GameSettings]: Skipping bad option: lastServer:
[11:28:28] [main/INFO] [net.minecraft.client.Minecraft]: LWJGL Version: 2.9.4
[11:28:32] [main/INFO] [Config]: [OptiFine]
[11:28:32] [main/INFO] [Config]: [OptiFine] OptiFine_1.12.2_HD_U_E3
[11:28:32] [main/INFO] [Config]: [OptiFine] Build: 20181210-121000
[11:28:32] [main/INFO] [Config]: [OptiFine] OS: Windows 10 (amd64) version 10.0
[11:28:32] [main/INFO] [Config]: [OptiFine] Java: 1.8.0_51, Oracle Corporation
[11:28:32] [main/INFO] [Config]: [OptiFine] VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
[11:28:32] [main/INFO] [Config]: [OptiFine] LWJGL: 2.9.4
[11:28:32] [main/INFO] [Config]: [OptiFine] OpenGL: GeForce GT 710/PCIe/SSE2, version 4.6.0 NVIDIA 430.86, NVIDIA Corporation
[11:28:32] [main/INFO] [Config]: [OptiFine] OpenGL Version: 4.6.0
[11:28:32] [main/INFO] [Config]: [OptiFine] Maximum texture size: 16384x16384
[11:28:32] [VersionCheck/INFO] [Config]: [OptiFine] Checking for new version
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] OpenGL Version: 4.6.0 NVIDIA 430.86
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] Vendor: NVIDIA Corporation
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] Renderer: GeForce GT 710/PCIe/SSE2
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] Capabilities: 2.0 2.1 3.0 3.2 4.0
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] GL_MAX_DRAW_BUFFERS: 8
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] GL_MAX_COLOR_ATTACHMENTS_EXT: 8
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] GL_MAX_TEXTURE_IMAGE_UNITS: 32
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] Load shaders configuration.
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] Save shaders configuration.
[11:28:32] [main/INFO] [net.optifine.shaders.SMCLog]: [Shaders] No shaderpack loaded.
[11:28:32] [main/INFO] [Config]: [OptiFine] [Shaders] Delayed loading of block mappings after resources are loaded
[11:28:33] [main/INFO] [FML]: Forge Mod Loader has detected optifine OptiFine_1.12.2_HD_U_E3, enabling compatibility features
[11:28:33] [main/INFO] [FML]: -- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1212347048 bytes (1156 MB) / 1509949440 bytes (1440 MB) up to 3221225472 bytes (3072 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML:
Loaded coremods (and transformers):
IELoadingPlugin (ImmersiveEngineering-core-0.12-89.jar)
blusunrize.immersiveengineering.common.asm.IEClassTransformer
MicdoodlePlugin (MicdoodleCore-1.12.2-4.0.2.210.jar)
micdoodle8.mods.miccore.MicdoodleTransformer
TransformerLoader (OpenComputers-MC1.12.2-1.7.4.153.jar)
li.cil.oc.common.asm.ClassTransformer
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 430.86' Renderer: 'GeForce GT 710/PCIe/SSE2'
[11:28:33] [main/INFO] [FML]: MinecraftForge v14.23.5.2768 Initialized
[11:28:33] [main/INFO] [FML]: Starts to replace vanilla recipe ingredients with ore ingredients.
[11:28:34] [main/INFO] [FML]: Replaced 1036 ore ingredients
[11:28:34] [main/INFO] [FML]: Searching C:\Users<censored>\AppData\Roaming.minecraft\versions\1.12.2-forge1.12.2-14.23.5.2768\mods for mods
[11:28:37] [VersionCheck/INFO] [Config]: [OptiFine] Version found: D3
[11:28:38] [main/INFO] [FML]: Forge Mod Loader has identified 12 mods to load
[11:28:39] [main/INFO] [FML]: Attempting connection with missing mods [minecraft, mcp, FML, forge, micdoodlecore, opencomputers|core, galacticraftplanets, galacticraftcore, immersiverailroading, opencomputers, trackapi, immersiveengineering] at CLIENT
[11:28:39] [main/INFO] [FML]: Attempting connection with missing mods [minecraft, mcp, FML, forge, micdoodlecore, opencomputers|core, galacticraftplanets, galacticraftcore, immersiverailroading, opencomputers, trackapi, immersiveengineering] at SERVER
[11:28:40] [main/INFO] [OpenComputers]: Successfully patched net/minecraft/client/renderer/entity/RenderLiving.renderLeash.
[11:28:44] [main/INFO] [net.minecraft.client.resources.SimpleReloadableResourceManager]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:Galacticraft Planets, FMLFileResourcePack:Galacticraft Core, FMLFileResourcePack:Immersive Railroading, FMLFileResourcePack:OpenComputers, FMLFileResourcePack:Track API, FMLFileResourcePack:Immersive Engineering
[11:28:44] [main/INFO] [FML]: Processing ObjectHolder annotations
[11:28:44] [main/INFO] [FML]: Found 1171 ObjectHolder annotations
[11:28:44] [main/INFO] [FML]: Identifying ItemStackHolder annotations
[11:28:44] [main/INFO] [FML]: Found 0 ItemStackHolder annotations
[11:28:44] [main/INFO] [FML]: Configured a dormant chunk cache size of 0
[11:28:44] [Forge Version Check/INFO] [forge.VersionCheck]: [forge] Starting version check at http://files.minecraftforge.net/maven/net/minecraftforge/forge/promotions_slim.json
[11:28:44] [Forge Version Check/INFO] [forge.VersionCheck]: [forge] Found status: UP_TO_DATE Target: null
[11:28:44] [Forge Version Check/INFO] [forge.VersionCheck]: [immersiveengineering] Starting version check at https://raw.githubusercontent.com/BluSunrize/ImmersiveEngineering/master/changelog.json
[11:28:46] [Forge Version Check/INFO] [forge.VersionCheck]: [immersiveengineering] Found status: UP_TO_DATE Target: null
[11:28:52] [main/INFO] [FML]: OBJLoader: Domain immersiveengineering has been added.
[11:28:52] [main/INFO] [immersiveengineering]: Custom OBJLoader: Domain has been added: immersiveengineering
[11:28:53] [Immersive Engineering Contributors Thread/INFO] [immersiveengineering]: Attempting to download special revolvers from GitHub
[11:28:53] [main/INFO] [immersiverailroading]: Loading stock rolling_stock/locomotives/a1_peppercorn.json
[11:28:54] [main/INFO] [immersiverailroading]: Loading stock rolling_stock/locomotives/big_boy.json
[11:28:56] [main/INFO] [immersiverailroading]: Loading stock rolling_stock/locomotives/k4_pacific.json

take out BlackThorne and UNU and run the pack again

As a test, I removed all the packs and it still crashed.

take out BlackThorne and UNU and run the pack again

going to test give me a few minutes

ok what point does it crash

ok found your problem you don't have enough RAM allocated to MC

my JVM args:
-Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M

have I done it wrong?

I have 3 gigabytes allocated. how is that not enough?

no where near. forge requires 4gb minimum IR requires you to have more

By that I meant four gigabytes or RAM have been allocated but I have eight installed to my system.

your system isn't going to play IR very well apart from base mod only. Your GPU doesn't have enough VRAM to support packs and you don't have enough free RAM for windows to give to GPU when it asks for it. try 4gb and see if that crashes still then up to 5gb but no more. try using better FPS, foamfix, optifine and in IR config turn on CacheIcons.

Oh. It was my first custom PC, and it can be rather problematic, so I have very little trouble accepting your diagnosis. I am planning a much better one though. Thank you very much for your help!

Update: Crashed with nothing but IR, IE, Track API, and OC. BTW, I have a Nvidia graphics card with 2gb of dedicated VRAM, does this help with the memory problem?

Have tried again with nothing but IR and Track API, still the same, but yesterday It was working fine? (only just remembered) However, it was working with a different directory.

NOTHING is working now. this mod has been such a [censored] pain in the [censored]

Have you increased the RAM for MC also post crash report and latest.log

I have fixed the problem, I had previously turned off VRAM; MC was depending on it because what I have as ordinary RAM was not enough.