Tunnel Plans Reviewed: Building a Brick Underground Hub
Introduction
When builders plan a brick city, the buildings and streets above ground usually get all the attention. But a city only feels complete when it has a working underground transit system. Tunnel plans are the underground engineering layer of that city, and they add both depth and realism. Whether it is a rail tunnel cutting through a mountain or a road tunnel running beneath downtown, a well-designed tunnel plan finishes the layout. This review looks at several popular tunnel plans and explains how to pick and build the one that fits your city.
Why Tunnels Matter in a Brick City
Adding Vertical Depth
A flat brick city can be beautifully detailed and still feel like a diorama. A tunnel plan pushes the layout from flat to three-dimensional: a train emerging from a mountainside, a car disappearing into an underpass. Those moments make the city feel believable and give you far more to play with.
Solving Traffic Layout Problems
On a limited baseplate, tunnels are the cleanest way to untangle crossing routes. With underground passages you can achieve:
- Grade-separated rail and road crossings
- An underground road system beneath the city center
- Hidden rail lines that run out of sight
- Connections between metro stations and commercial districts
Tunnel Plan Reviews
1. Mountain Rail Tunnel
This tunnel plan is built around a mountainside bore and is the first choice for rail fans.
Plan features:
- Tunnel length: fits 8-12 standard train cars passing through
- Mountain shell: stacked layers of bricks that form a natural-looking hillside
- Portal: arched design with masonry texture detailing
- Included scenery: signal lights, track, tunnel portal nameplate
Difficulty: ★★★☆☆ (medium) Part count: roughly 1,200 pieces (train and track not included)
Design highlights:
- Trees can be planted on the mountain surface for a natural blend
- Interior space is reserved for lighting
- Modular design lets you extend the tunnel length
2. City Road Tunnel
A road tunnel plan aimed at city builders, with more emphasis on connecting to buildings.
Core design:
- Dual carriageway, four lanes
- Tunnel portal aligns flush with city roads
- Tiled tunnel walls that mimic real concrete lining
- Ventilation openings and lighting system
Best used for:
- Downtown underpasses
- Tunnels passing beneath large buildings
- Transition sections between elevated viaducts and street level
3. Metro Station and Tunnel Complex
The most capable option, combining a metro station with its connecting tunnels.
Combined functions:
- Underground platform level (waiting area plus track area)
- Concourse level (ticket sales, entry and exit gates)
- Connecting passages linking different lines
- Surface entrances with metro signage
Space requirement: a large baseplate footprint (at least 48x48 studs recommended)
4. Simple Mountain Bore
A beginner-friendly tunnel plan: simple structure, surprisingly good results.
Easy to start with:
- Around 300-500 parts
- Build time of roughly 1-2 hours
- Matches standard track height
- Clean mountain shape that is hard to get wrong
Buying Guide for Tunnel Plans
Choose by City Scale
| City scale | Recommended tunnel type | Suggested quantity |
|---|---|---|
| Small city (32x32 baseplate) | Simple mountain bore | 1-2 |
| Medium city (48x48 baseplate) | Road tunnel plus rail tunnel | 2-3 |
| Large city (multiple baseplates joined) | Integrated tunnel system | 3-5 or more |
Match Your Train Type
Different trains need different tunnel dimensions:
- Standard trains: tunnel at least 8 bricks high and 12 studs wide
- Narrow gauge trains: 6 bricks of clearance is enough
- High-speed trains: wider tunnel spacing required
Choose by Function
- Traffic first: go with a road tunnel or metro tunnel
- Scenery first: go with a mountain tunnel and focus on the exterior shape
- Both: go with a combined plan such as the metro station complex
Build Tips and Things to Watch
Structural Design
- Arched load bearing: an arched tunnel roof carries weight far better than a flat one
- Modular building: build the portal, middle section and exit as separate modules
- Plan your seams: leave alignment interfaces between modules so they line up
- Reinforce: add support columns in the middle of long tunnels to prevent sagging
Interior Detailing
A good tunnel plan should include interior detail:
- Tunnel wall lights (transparent parts work well)
- Cable runs (hose or thin rod elements)
- Emergency exit signage
- Striped wall banding along the lining
Blending With the Cityscape
- Plant climbing greenery at the portal for a natural transition
- Add trees and rock formations on top of mountain tunnels
- Place street signs and lamps at city tunnel entrances
- Build a park or a building above the tunnel
Scene Ideas to Extend Your Tunnel
Rail Tunnel Scenes
- Twin parallel bores to represent a double-track railway
- A signal box beside the portal
- A lookout tower on top of the mountain
Road Tunnel Scenes
- A toll plaza at the tunnel entrance
- A staged "accident" scene inside the tunnel
- An overpass built above the tunnel
Integrated Transit Hub
- Rail and road tunnels crossing at different levels
- A tunnel connecting to an underground parking garage
- A metro station linked underground to a shopping street
Designing Tunnel Plans Digitally
If none of the existing plans suit you, you can design your own tunnel:
Recommended Tools
- Studio 2.0: the mainstream MOC design software, supports simulating tunnel structures
- Bricklink Part Designer: for custom part colors
- brickplan.cn: an online plan editing and sharing platform
Design Notes
- Fix the dimensions of your train or vehicle first
- Test critical structures with real bricks
- Leave working space inside the tunnel so you can place minifigures and vehicles
- Reserve room for lighting and decoration
Final Thoughts
A tunnel plan is an essential part of brick city building. It takes a city from flat to layered, from simple to convincing. Whether you are a rail fan, a city builder or a scene maker chasing realism, the right tunnel plan will noticeably lift your brick world.
On brickplan.cn you can find more quality tunnel plans and city building schemes. From mountain bores to downtown underpasses, complete your transport network and build a city with real depth.