RMT members working on the Heathrow Express have voted for strike action and action short of a strike in a row over the dismissal of a driver and treatment of an RMT representative.
The union says nearly 80% of those voting backed strike action over the two complaints.
General Secretary Bob Crow said; “The unfair and disproportionate punishment taken by management in both these cases is a total miscarriage of justice and that is reflected in these overwhelming ballot results for action.
“Management’s behaviour clearly demonstrates their willingness to victimise staff at the slightest provocation and no doubt they see this as payback for the successful building of a strong and militant union organisation within the company.
A spokesperson for Heathrow Express said: “We are disappointed the RMT chose to ballot its members for industrial action. The ballot centres around the suspension of one member of staff and the dismissal of another.
“The suspended employee has already returned to work and the dismissal was conducted via a fair and legitimate policy agreed with the Union. We hope Union members will recognise this and as always, we remain open for discussions with the RMT.”