Passengers could see their journeys derailed after union members voted overwhelmingly in favour of strike action on the Docklands Light Railway.

More than 300 DLR staff will walk out over a range of issues including the use of agency staff and a “creeping culture of bullying and intimidation of staff”, RMT general secretary Mick Cash announced today.

A date is still to be set for the action, triggered by bad relations with KeolisAmey Docklands, the operator of the TfL network.

“Our members on DLR are furious at the way that KeolisAmey are trying to bulldoze in some of the worst working practices and conditions that we associate with the operations of the most cheapskate and anti-union companies in the transport sector and that anger is reflected in these ballot results,” Mr Cash said.

“We will not sit back and allow this aggressive and bullying culture to develop on this key part of London’s transport network.”

The results of the poll were conclusive, with 92 per cent backing strike action.

Mr Cash added: “The company should not have underestimated the anger of the workforce and KAD’s abject failure to address these issues, which left us with no option but to ballot for action.”

More than 100million journeys are made annualy on the 25 mile long network, which passes through much of Newham, including Stratford, Beckton and Silvertown.

The managing director of KeolisAmey Docklands responded: “We are disappointed that the RMT union plan to ballot our employees.

“This action is unnecessary and we are working to ensure we continue to deliver a normal and reliable service to DLR passengers every day.

“We continue to meet with the union to actively seek a resolution to the issues they have recently raised.”

Those issues also include “casualising key functions” as well as “breaches of agreements, procedures and the recognition framework”.