How they are made

For the standard structures, each part is laser cut from aluminium alloy sheet, cleaned, deburred, brake-pressed, joggled if required, and then riveted into the assembly using solid rivets. Here is a plate girder rib as cut and after forming:

Parts are often altered from standard to suit particular variants, and this is mostly done by hand.

Below is a sub-assembly of an all steel custom bridge that went to a client in Türkiye to display his 1:8 scale live steam locomotive (see bottom of the page):