The current map used a lot of (dark) green with very low contrast between ground and other items such as factories, railways and roads. This makes it very hard or even impossible to find most factories on the map. Especially when colour blind or when playing in a bright environment.
I have added some examples, with the car factory being a positive example. It's bright 'icon' makes it easy to find.
Having more contrast between the icons and the map, or also having the option to always show Factorynames on the map (as it does with mouseover) would be a nice accessibility option.