Road underpass frame, rectangular – 4 m or 7.5 m road under the embankment, N, TT, H0

Description

Where a road passes under the embankment, a concrete frame carries the track. The frame is as long as the formation of a single-track line is wide; ballast bed and track lie on top, and the wing walls retain the slope.

• Two road widths: 4.0 m (one lane) and 7.5 m (two lanes), clear height 4.5 m.
• Length and slope to the standard: frame as long as the formation, wing walls at 1:1.5.
• Concrete with formwork joints, printed face down; no lettering.

In the set per scale:

• N: passage 25 or 46.9 mm wide, 28.1 mm high; frame 38 mm long (formation width)
• TT: passage 33.3 or 62.5 mm wide, 37.5 mm high; frame 50 mm long (formation width)
• H0: passage 46 or 86.2 mm wide, 51.7 mm high; frame 70 mm long (formation width)
• Per scale two frames (road 4 m and 7.5 m) and one wing wall (print four).

Scales: One variant per scale: N (1:160), TT (1:120) and H0 (1:87). Each variant contains the single parts and a collection plate with all parts of the scale (3 mm apart).

Dimensions: Dimensions taken from NEM 122 (2007 edition). The ballast bed lies on the frame: by the same standard the rail top sits the ballast height h above the formation (10 mm in H0). Clear height (4.5 m), road widths and wall thickness (0.5 m) are a free choice, i.e. an estimate, not true to the prototype. How accurate it turns out depends on your printer, and our part has not been tested on a layout yet. Print the free check gauge first to see in advance whether clearance and distances suit your setup.

Material: PLA is enough because the layout stays indoors; PETG works too. 0.4 mm nozzle, ideally 0.12 mm layers, no supports.

Not a toy. Model-making accessory for model railway hobbyists aged 14 and up; contains small parts that can be swallowed, keep out of reach of small children.

Dimensions

Dimensions of the default variant in print orientation.

Material and temperature

PLA is enough for gauges and structural parts (0.4 mm nozzle). For small details use resin or a 0.2 mm nozzle. With resin: wear gloves, follow the resin manufacturer's instructions and cure the parts fully.

Print orientation: Face down.

Safety notice

Not a toy. Model-making accessory for model railway hobbyists aged 14 and up; contains small parts that can be swallowed, keep out of reach of small children. Not a toy. Model-making accessory for model railway hobbyists aged 14 and up; contains small parts that can be swallowed, keep out of reach of small children.

Not an original part. No affiliation with the manufacturers named; brand and model names only indicate fitment.

What's included

You get one ZIP for the version you choose, with:

• STL – print-ready mesh
• 3MF – with print profile
• STEP – editable in CAD

Files per version

Version	Contains	Price
N (1:160)	unterfuehrungsrahmen-rechteckprofil_n_sammelplatte.stl, unterfuehrungsrahmen-rechteckprofil_n_sammelplatte.3mf, unterfuehrungsrahmen-rechteckprofil_n_sammelplatte.step, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_4m.stl, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_4m.3mf, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_4m.step, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_7_5m.stl, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_7_5m.3mf, unterfuehrungsrahmen-rechteckprofil_n_rahmen_strasse_7_5m.step, unterfuehrungsrahmen-rechteckprofil_n_fluegelmauer.stl, unterfuehrungsrahmen-rechteckprofil_n_fluegelmauer.3mf, unterfuehrungsrahmen-rechteckprofil_n_fluegelmauer.step	€3.90
TT (1:120)	unterfuehrungsrahmen-rechteckprofil_tt_sammelplatte.stl, unterfuehrungsrahmen-rechteckprofil_tt_sammelplatte.3mf, unterfuehrungsrahmen-rechteckprofil_tt_sammelplatte.step, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_4m.stl, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_4m.3mf, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_4m.step, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_7_5m.stl, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_7_5m.3mf, unterfuehrungsrahmen-rechteckprofil_tt_rahmen_strasse_7_5m.step, unterfuehrungsrahmen-rechteckprofil_tt_fluegelmauer.stl, unterfuehrungsrahmen-rechteckprofil_tt_fluegelmauer.3mf, unterfuehrungsrahmen-rechteckprofil_tt_fluegelmauer.step	€3.90
H0 (1:87)	unterfuehrungsrahmen-rechteckprofil_h0_sammelplatte.stl, unterfuehrungsrahmen-rechteckprofil_h0_sammelplatte.3mf, unterfuehrungsrahmen-rechteckprofil_h0_sammelplatte.step, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_4m.stl, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_4m.3mf, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_4m.step, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_7_5m.stl, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_7_5m.3mf, unterfuehrungsrahmen-rechteckprofil_h0_rahmen_strasse_7_5m.step, unterfuehrungsrahmen-rechteckprofil_h0_fluegelmauer.stl, unterfuehrungsrahmen-rechteckprofil_h0_fluegelmauer.3mf, unterfuehrungsrahmen-rechteckprofil_h0_fluegelmauer.step	€3.90

Printing

1. PLA (or PETG), 0.4 mm nozzle, 0.12 mm layers, 2 walls, 15 % infill, no supports.
2. Frame face down, wing walls flat.

Installation

1. Stand the frame on the road, glue the wing walls to both ends angled outward, build up the embankment, lay ballast and track on top.

FAQ

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Version 1.0.0, updated 5 November 2026 · SKU MB-UNDERPASS