Introduction

Adding grades and inclines to your model railroad layout brings it to life, creating realistic mountain passes, hillside towns, and dramatic elevation changes. Whether you’re modeling a mountain railroad or simply want to add visual interest, building a smooth, reliable incline is a fundamental skill every model railroader should master.

Understanding Grade Percentages

A grade is expressed as a percentage — the number of inches of rise per 100 inches of horizontal run. For example, a 2% grade rises 2 inches over 100 inches of track. Here’s a quick reference:

• 1% grade – Very gentle; suitable for long trains and heavy consists
• 2% grade – The recommended maximum for most model railroads
• 3% grade – Steep; expect reduced train length and pulling power
• 4%+ grade – Very steep; best reserved for short, light trains or trolleys

As a rule of thumb, keep grades at 2% or less for reliable, trouble-free operation.

Planning Your Incline

Before cutting any foam or wood, plan your incline on paper or in track planning software. Key considerations include:

• Total rise: How high does the track need to climb?
• Available run: How much horizontal distance do you have?
• Transition curves: Allow at least 18–24 inches of level track at the top and bottom of the grade to prevent cars from uncoupling or derailing.

Use the formula: Grade % = (Rise ÷ Run) × 100 to verify your planned grade before building.

Materials You’ll Need

• Extruded foam insulation board (1″ or 2″ thick) or plywood subroadbed
• Commercial incline sets (e.g., Woodland Scenics Incline Starter Set) or homemade risers
• Carpenter’s glue or foam-compatible adhesive
• Sandpaper (medium grit)
• Ruler, pencil, and a long straightedge
• Track and roadbed

Method 1: Commercial Incline Sets

The easiest approach for beginners is a pre-made incline system like the Woodland Scenics Incline Starter Set. These foam risers are pre-cut to a consistent 2% grade and stack to achieve your desired height.

1. Dry-fit the risers along your planned route to confirm the grade and fit.
2. Glue the risers to your layout base using foam-compatible adhesive.
3. Allow to dry fully before laying roadbed and track.
4. Sand any transitions smooth to prevent bumps that could cause derailments.

Method 2: Homemade Foam Risers

If you prefer a DIY approach, you can cut your own risers from extruded foam board.

1. Calculate the height needed at each support point based on your grade percentage and spacing.
2. Cut foam blocks to the appropriate heights, incrementing gradually along the run.
3. Glue the blocks in place and lay a strip of 1/8″ or 1/4″ foam or thin plywood over the top as a smooth subroadbed surface.
4. Sand transitions at the top and bottom of the grade for a smooth entry and exit.

Method 3: Plywood Cookie-Cutter or L-Girder Construction

For benchwork-based layouts, inclines are often built by tapering the subroadbed itself:

1. Mark the rise and run on your subroadbed strip.
2. Use a jigsaw to cut a gentle taper along the length of the subroadbed.
3. Support the elevated end with risers or adjustable legs attached to the benchwork.
4. Ensure the subroadbed is firmly supported at regular intervals to prevent flex.

Laying Track on the Incline

Once your subroadbed is in place, laying track on a grade is similar to level track — with a few extra precautions:

• Use flexible track for smooth, kink-free curves on grades.
• Spike or glue track securely — gravity can cause track to shift over time.
• Test with your longest, heaviest locomotive before scenicking to catch any problem spots.
• Avoid placing turnouts (switches) on grades whenever possible.

Testing Your Grade

Before adding scenery, run trains repeatedly over the incline to verify reliable operation:

• Test with the longest train you plan to run.
• Check for derailments at the transition points at the top and bottom of the grade.
• Verify that your locomotive can pull the intended load without stalling.
• If trains struggle, consider reducing the grade or shortening train length.

Adding Scenery to Your Incline

Once operation is confirmed, the incline becomes a natural focal point for scenery. Consider:

• Rocky cuts and retaining walls along the sides of the grade
• Tunnels through hills at the top of the incline
• Bridges and trestles spanning valleys below
• Ground cover, trees, and rock castings to blend the grade into the landscape

Final Tips

• Always build and test your incline before adding scenery — it’s much easier to fix problems early.
• Keep grades consistent — avoid sudden changes in grade percentage mid-run.
• Label your grade percentage on your track plan for future reference.
• When in doubt, go shallower — a 1.5% grade is always more reliable than a 3% grade.
• Do not add a turnout (switch to a branch line) at the beginning or at the end of an incline.

With careful planning and construction, a well-built incline will add drama and realism to your layout for years to come. Happy modeling!