You are looking at a 3d printed OO Gauge Modular Model Railway Arches Road Bridge Support Wall Sections Retaining Walls.
There are pefect for having along side platforms as they are slightly raised (non raised version available in our shop). Modelled around a platform that is 19mm in height - see images for inspiration - you will not receive any painted items/platform that is in the picture it is purely illustration only.
These walls are modular as i hope you can see with the images, the end cap pillars and centre joining pillars all push together so you can in theory expand these walls and have as many as you wish. We have put the option up to a quadruple wall set up in the drop downs just to keep things simple (with cost reduction as you go up the number of walls).
If you wish to buy more than 4 just simply by another product, e.g. you might want 6 walls, so you would buy a quadruple and then a double - these are all modular so will fit together perfectly in the length you want to order. With each order you will get the relevant joining pins (which clip each section of wall together) to make a full run of wall - as well as 2 end caps to finish the walls and as many joining posts as is required e.g. you order a double wall you will receive 1 x joining piece, triple and receive 2. etc.
Dimensions:
Walls: 150mm Width x 14.5mm Depth x 122mm Height
End caps: 16.5cm Width x 13mm Depth x 125mm Heigh