Building a functional train chassis in Plane Crazy requires two separate wheel assemblies called bogies, an anti-derailment guide system, and unpowered pivot motors to navigate bends. Connecting rigid wheels directly to a long frame causes instant derailment on track corners, but using unpowered motors as free-floating bearings lets each bogie pivot independently along the rails.
Preparing the Rail Spawn and Track Alignment
Before placing any structural blocks, configure your plot settings so your creation spawns directly over the track.
- Open your build plot menu and select the gear icon to access the spawn settings.
- Change the spawn location to the rails setting. A transparent rail overlay will appear on your plot to mark the track position.
- Align your build with the rail lines. In Plane Crazy, the railroad tracks—located along the left side of the base—measure approximately 7 to 9 blocks wide.
Step-by-Step Bogie Construction
A standard locomotive chassis uses two bogies: a front bogie and a rear bogie. Each bogie acts as an independent sub-assembly that holds both drive wheels and track guides.
1. Drive Wheel Placement and Motor Controls
Standard train wheels can be built using motors and 3x3 cylinder blocks:
- Place marker blocks across the width of the rail guide to establish your axle positions.
- Attach drive motors horizontally on both sides of the bogie frame.
- Place 3x3 cylinders directly onto the drive motors to serve as wheels. Setting the cylinder material to Fabric is an optional builder technique that provides additional traction on the tracks.
- Configure your motor keys. Set one side to standard forward and backward controls (such as W and S) and invert the opposite side (S and W) so both sides drive in the same direction.
- Set motor speed to approximately 25 to ensure controllable, smooth acceleration during initial track testing.
2. Derail-Proof Guide Wheel Setup
Placing simple drive wheels directly on top of the rails will cause your train to fly off the track as soon as it enters a turn. To keep the train locked between the rails, you must add vertical guide wheels (pegs):
- Place a motor on the bogie facing downwards, with the narrow axle end pointing toward the ground.
- Attach a horizontal 3x3 cylinder to this downward-facing motor so the cylinder sits inside the track gap between the two rail lines.
- Configure the guide wheels to sit snugly against the inner rail edges. These horizontal cylinders push against the track borders during turns, mechanically forcing the bogie to follow curves.
Connecting Bogies with Free-Floating Bearings
A functional train chassis cannot have its front and rear bogies welded solidly to the main deck. Rigid frames cannot bend around corners and will derail immediately upon entering track curves.
| Component | In-Game Configuration | Primary Purpose |
|---|---|---|
| Drive Motors | Powered, WS / SW controls, speed ~25 | Propels the chassis along the track |
| Drive Wheels | 3x3 Cylinders (Fabric material optional) | Rail contact and movement traction |
| Guide Motors & Pegs | Downward-facing motors with horizontal 3x3 cylinders | Locks bogie inside track rails to prevent derailment |
| Bogie Pivot Motors | Unpowered (untick power setting / black icon) | Functions as a free-spinning bearing to allow cornering |
| Main Frame | Beams (such as 1x7 beams) and half blocks | Connects both bogie pivots and holds the Main Pilot Seat |
To install the pivot mechanism:
- Place a motor in the center of each completed bogie assembly, pointing upward into the locomotive frame.
- Open the motor configuration menu and untick the power option. This turns the motor connection black, disabling its motor drive and transforming it into a free-floating bearing.
- Bridge the two unpowered pivot points using structural blocks or 1x7 beams.
- Mount the Main Pilot Seat centered along this connecting frame.
- Test the assembly on sharp switch tracks. As the front bogie enters a curve, the unpowered motor allows it to turn independently while the rear bogie continues tracking straight, maintaining full stability.
Customizing the Locomotive Chassis
Once the bare rolling chassis clears corners reliably, you can build your locomotive body above the pivot points:
- Frame Clearances: Use half blocks or elevated beams around the wheel wells to prevent your upper bodywork from colliding with the rotating bogies.
- Wheel Layouts: The same dual-bogie bearing structure can be adapted into a classic Bo-Bo configuration (two axles per bogie) or extended for larger three-axle diesel locomotives, such as ALCO units or British Rail Class 40 builds.
- Rolling Stock: Removing the drive motors and leaving only guide pegs and free-spinning wheels turns this exact chassis layout into passenger coaches or freight cars that can be pulled by an engine.
Frequently Asked Questions
Why does my train derail immediately when entering a turn?
Derailment on turns is typically caused by two issues: missing guide pegs or rigid bogie connections. If your wheels do not have downward-facing horizontal cylinders hugging the inside of the rails, the train has no physical barrier keeping it on the track. If your bogies are attached without unpowered pivot motors, the chassis cannot rotate to match the rail curve.
How do I make the bogies turn freely without manual steering?
Place a standard motor between the bogie and the chassis beam, open its configuration menu, and untick the power toggle. This removes engine torque and allows the motor to spin loosely like a passive axle bearing whenever the guide wheels follow a curve.
Can I build bogies that handle rail elevation changes?
Basic bogies swivel horizontally to take rail turns. Handling steep vertical hills requires advanced bogies that can move up and down at angles to tackle gradients.
