Heavily modified version of the original built in portal basic asset by Auran, with a new mesh one eighth the length of the built in portal basic.  Handy if you are trying to sqeeze a portal into a route with restricted space.  The default track is my low poly tunnel track (KUID:243828:100039) which will stop the smoke effects from locos risng through the scenery.
  
   
    | kuid | author | kind | name | build | date | size | 
   
    | <kuid2:57443:100001:1> | #57443 | map | Mohawk Industrial Railroad | 5 | 27.09.2025 10:54:59 | 5.1 MB | 
   
    | <kuid2:132608:100685:1> | #132608 | map | (Beko) Rangierbahnhof-Maschen | 5.3 | 14.06.2024 16:20:46 | 60.3 MB | 
   
    | <kuid:243828:100430> | #243828 | map | C+ 14 Westwold RC1 | 3.7 | 5.09.2025 18:26:50 | 108.0 kB | 
   
    | <kuid:323914:100453> | #323914 | map | Holzhausen2-TRS2022+ | 5.2 | 21.09.2025 18:18:56 | 6.1 MB | 
   
    | <kuid2:323914:100453:1> | #323914 | map | Holzhausen2-TRS2022+ | 5.2 | 21.09.2025 18:19:21 | 6.1 MB | 
   
    | <kuid:323914:100681> | #323914 | map | Doellnitzbahn+Erweiterung Neichen-750mm(TS22PE) | 5.5 | 3.11.2024 23:18:42 | 8.7 MB | 
   
    | <kuid:411884:100803> | #411884 | map | Deadwood Lumber & Mine Co. V8 | 4.3 | 12.09.2025 3:30:29 | 1.3 MB | 
   
    | <kuid2:515942:100004:1> | #515942 | map | 1930s Cornish Mainline and Branches - Truro to Penzance | 4.3 | 27.08.2025 6:52:15 | 50.9 MB | 
   
    | <kuid:515942:100072> | #515942 | map | TANE, 1930s Cornish Mainline - Truro to  Penzance, Phase 1 Redruth | 4.2 | 16.09.2025 12:30:41 | 5.7 MB | 
   
    | <kuid:515942:100218> | #515942 | map | 1930s English Branchline - The Maritime Line (Truro to Falmouth) | 3.7 | 27.08.2025 16:29:27 | 10.2 MB | 
   
    | <kuid:515942:100271> | #515942 | map | Revised 1930s English Branchline - The Maritime Line (Truro to Falmouth) | 3.7 | 15.09.2025 22:13:14 | 10.2 MB | 
   
    | <kuid:515942:100313> | #515942 | map | 1930s Cornish Mainline - Truro to  Penzance, Phase 1 Redruth | 3.7 | 27.08.2025 16:43:42 | 5.9 MB | 
   
    | <kuid:515942:100334> | #515942 | map | 1930s Cornish Mainline - Truro to  Penzance, Camborne Sector | 3.7 | 28.08.2025 13:36:24 | 8.7 MB | 
   
    | <kuid:515942:100360> | #515942 | map | 1930s Cornish Mega Package | 3.7 | 28.08.2025 13:36:53 | 16.6 MB | 
   
    | <kuid:850934:101722> | #850934 | map | 1930 Cornish Full - Mini | 4.5 | 28.08.2025 13:36:02 | 70.0 MB | 
   
    | <kuid:879914:101170> | #879914 | map | 1930s Cornish Mainline and Branches - Truro to Penzance with out trains | 4.5 | 27.08.2025 17:20:59 | 70.2 MB | 
   
    | <kuid:919773:100350> | #919773 | map | BRR2 | 4.6 | 5.09.2025 12:03:21 | 118.0 MB |