roll cage

roll cage (plural roll cages)

1. (automotive) A frame built in or around the driver and passenger compartment of a vehicle to protect its occupants from being injured in an accident, particularly if the vehicle rolls over.
2. A cage-like container mounted on small wheels, which can be rolled on and off a vehicle and used for the transport of goods.
   • 2020 May 6, “Network News: GBRf mobilises ex-commuter '319' for Euston freight trial”, in Rail, page 15:

     The trial was designed to showcase what could be successfully loaded and offloaded using standard roll cages at most main line stations and was the first of its kind in the UK to be carried out using a former commuter EMU.

• roll bar

• collager