An effective internal transportation of mail can be achieved by use of mailroom trolleys. These come in various designs and configurations depending on requirements and applications. The compartmentalisation of trolley baskets by using Concertina File Inserts held into place by steel rods allows for efficient segmentation and dissemination of internal mail for re-routing. In practice these trolleys are used in offices for movement between floors, hospitals for medical records, and many other applications and environments.