You are looking at a build your own style OO Gauge Model Railway Brick Arch Underpass Support Wall For Walkways Roads
When railway arches are used to support elevated railway lines some of the arches are used as walkways or have roads travelling through them so this design enables you to do this. This item could also be used to make a bridge. You can purchase what you like and that can be glued together to create the length you require under the track. The average brick size is about 3mm long and these sections are made up of factors of 3mm.
The sizes available are width of walkway: 9mm, 18mm, 36mm, 48mm and 96mm. With these lengths, you should be able to create any length required by adding multiples and gluing together.
The railway arch sections are 120mm wide and either 100mm or 120mm tall. The arch front is about 9mm deep with the arch centre itself being 100mm wide and 65mm high.
Please note: images that include all the items are just a guidance as to what you can achieve, you will receive what you select from the drop down and add multiples to make your own pack e.g. 2 x 100mm tall arch sections and 1 x 48mm walkway, or 4 x 100mm tall arch and 2 x 48mm walkway - depending on how long and how many arches you require.