... replacing blocks?). The alternative would be to create the blocks at full prototype size, and in all cases scale them down to the model scale when inserting them. This has the advantage that you could create the replacement blocks at full-size, and they would work at any scale in any file. The disadvantage is that you need to know about this in advance, and so does anyone else using the DXF file similarly. What do you think? Here's the file attached. These are all scaled blocks: 2_281731_270000000.png *I have heard of miniature 5" gauge railways being modelled in parks on Gauge 1 and 16mm scale layouts. cheers, Martin. Attachment: attach_2715_2734_midland_central_1 8_07_28_2225_26_mm.dxf 212 posted: 29 Jul 2018 20:08 from: Andrew Barrowman Hi Martin, TurboCAD identifies your blocks. They appear in the blocks palette (Tools, Palettes, Blocks...) but I can't substitute my blocks for them nor will it let me substitute any of your blocks for them. TurboCAD allows the reference point of a block to be relocated ...