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 ceased functioning around the mid-1970s. However, the discontinuation of trolleybus services in Bradford gave rise to the creation of the Bradford Trolleybus Association, which has since become an active contributor.