NMRA Mark III HO Scale Standards Gauge (RP-25 Contour) – Vintage Model Railroad Track & Wheel Gauge with Instructions

Product Description

Ensure your HO scale railroad performs at its best with this NMRA Mark III HO Scale Standards Gauge. Produced by the National Model Railroad Association (NMRA), this precision gauge is an essential tool for checking wheelsets, track gauge, flangeways, clearances, and coupler heights to NMRA Recommended Practices.

Compatible with RP-25 wheel contours, the Mark III gauge is a must-have for hobbyists building, maintaining, or troubleshooting HO scale layouts. This vintage set includes the original August 1980 RP-2 instruction sheet and original packaging.

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Features

• HO Scale (1:87)
• Genuine NMRA Mark III Standards Gauge
• Compatible with RP-25 Wheel Contours
• Precision-machined metal gauge
• Checks multiple NMRA standards
• Includes original instruction sheet
• Original packaging included
• Excellent tool for layout construction and maintenance

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Gauge Functions

Checks and verifies:

• Wheel Gauge (S-3)
• Track Gauge (S-4)
• Flangeway Width
• Check Gauge
• Frog Clearance
• Rail Clearance
• Guard Rail Spacing
• Trolley Wire Gauge (S-6)
• Additional NMRA Recommended Practice dimensions

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Condition

• Excellent pre-owned condition.
• Metal gauge shows light signs of previous use.
• Original instruction sheet dated August 1980 (RP-2) included.
• Original packaging included with minor shelf/storage wear.
• Please review all photos carefully, as they are part of the item description.

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Specifications

• Manufacturer: National Model Railroad Association (NMRA)
• Product: Mark III Standards Gauge
• Scale: HO Scale (1:87)
• Standard: RP-25 Contour
• Material: Precision Metal
• Recommended Practice: RP-2
• Instruction Date: August 1980

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Perfect For

• HO scale layout construction
• Track installation
• Wheelset adjustment
• Locomotive maintenance
• Freight and passenger car tuning
• DCC layout troubleshooting
• Serious model railroaders