The Notts & Derby Transport Society also ceased to be in the mid-1970s, but the end of trolleybus operation in Bradford resulted in the formation of the Bradford Trolleybus Association, and they have since become an active participant.
The Notts & Derby Transport Society also went out of operation in the mid-1970s, but the conclusion of trolleybus operations in Bradford led to the establishment of the Bradford Trolleybus Association, and they have since become a dynamic participant.