The mid-sized excavator category get the job done, while staying in a highly mobile size range. Featuring both track and wheel excavators.
Mid-sized excavators fall between the mini and the large - and can be called "medium" or in some cases "small." Sizes range from around 25K pounds to around 100K pounds.
Cat is one of the brands the breaks it's mid-sized digger line into two categories, medium and small.
Medium models can be found here: https://www.cat.com/en_US/products/new/equipment/excavators/medium-excavators.html
Small models can be found here:
Deere digs a little deeper on their mid-sized cateogry, going down into the 16K pounds - but clearly this is the meat of their lineup! Deere models can be found here: https://www.deere.com/en/excavators/mid-size-excavators/
Komatsu has a range of mid-sized diggers from 25K pounds to 70K pounds. You can see there models here: https://www.komatsuamerica.com/equipment/excavators/mid-size
Hitachi has a big range in the mid-sized category. You can see hitachi mid-sized diggers here: https://www.hitachicm.eu/machinery/excavators/medium-excavators/
In the mid-sized category we start to see wheel excavators. These diggers show versatility and mobility! Doosan wheeled diggers can be seen here: https://na.doosanequipment.com/en/construction-equipment/wheel-excavators