1. Product Overview
The TOMIX 4258 N Gauge Island Type Local Type Covered Extension Part is designed to expand your model railway diorama. This set includes two local island home sections with chevron roofs, allowing you to extend your platform by approximately two car lengths (equivalent to 66.6 ft or 20 m class vehicles).
Key Features:
- Combines seamlessly with Wooden Station Sha sets for expanded layouts.
- Includes two local island home sections with chevron roofs.
- Extends platform length to accommodate approximately two 20m-class railway cars.
- Allows for installation of vendors, benches, and drinking areas (requires drilling).
- Provides designated areas for attaching station and number marks on the roof.

Figure 1.1: Overview of the TOMIX 4258 N Gauge Island Type Local Type Covered Extension Part.
2. Package Contents
Please verify that all components are present and undamaged upon opening the package:
- 2 x Local Island Home sections with chevron roofs
- Instruction sheet (this manual)
Note: Adhesives, tools, and paints are not included with this product. This product does not emit light or sound, and does not use batteries or fuel.
3. Setup and Assembly
Follow these steps to assemble and integrate your TOMIX 4258 extension part into your diorama:
- Unpack Components: Carefully remove all parts from the packaging.
- Connect Sections: Align the two island home sections and connect them securely. The design allows for a seamless extension of your existing platform.
- Optional Customization (Drilling Required): If you wish to install miniature vendors, benches, or drinking areas on the platform, drilling into the home section is required. Use appropriate tools and exercise caution.
- Attach Marks: Station and number marks can be attached to the designated areas on the roof of the island home sections.

Figure 3.1: The TOMIX 4258 extension part, illustrating its design and potential for customization.
4. Integration and Usage
The TOMIX 4258 extension part is designed to integrate with other TOMIX N Gauge diorama elements, particularly the Wooden Station Sha sets (e.g., TOMIX 4251 Wooden Station Set (Local Type) and 4252 Opposing Home Set (Local Type)).
- Position the extended island home alongside your railway tracks.
- Ensure proper alignment with existing station platforms or track sections for a realistic appearance.
- The extended platform can accommodate longer train compositions, enhancing the realism of your N Gauge layout.

Figure 4.1: Examples of the TOMIX 4258 extension integrated with other TOMIX N Gauge sets, demonstrating various layout possibilities.
5. Care and Maintenance
To ensure the longevity and appearance of your TOMIX 4258 extension part, follow these simple maintenance guidelines:
- Cleaning: Gently wipe the surfaces with a soft, dry cloth to remove dust. For stubborn dirt, a slightly damp cloth can be used, but avoid excessive moisture.
- Storage: Store the model in a cool, dry place away from direct sunlight and extreme temperatures to prevent warping or discoloration.
- Handling: Handle the model with care to avoid breaking delicate parts.
- Chemicals: Do not use harsh chemicals, solvents, or abrasive cleaners, as these can damage the plastic material and paint finish.
6. Troubleshooting
This product is a static model accessory and has no electronic or moving parts. Most issues will relate to assembly or integration.
| Problem | Possible Cause | Solution |
|---|---|---|
| Sections do not connect smoothly. | Misalignment or debris in connectors. | Ensure parts are correctly oriented. Check for and remove any small plastic burrs or debris from the connection points. |
| Platform does not sit level. | Uneven surface or improper connection. | Place the model on a flat, stable surface. Re-check connections between sections to ensure they are fully engaged. |
| Custom accessories (benches, vendors) do not fit. | Incorrect hole size or placement. | Verify the required hole size for your accessories. Ensure drilling is done precisely and carefully. |
7. Product Specifications
| Attribute | Detail |
|---|---|
| Brand | TomyTEC |
| Model Number | 4258 |
| Material | Plastic |
| Color | Multicolor |
| Product Dimensions (L x W x H) | 11.02"D x 1.97"W x 1.57"H (approx. 28cm x 5cm x 4cm) |
| Item Weight | 3.87 ounces (approx. 110g) |
| Number of Items | 1 (set includes 2 island home sections) |
| Mounting Type | Floor Mount |
| Release Date | October 31, 2024 |





