Workers who control the power to run trains on London Underground were set to strike for eight days from 8pm on Tuesday of this week.
The dispute involves members of the Unite, RMT and TSSA unions.
In August last year London Underground terminated the private finance initiative (PFI) contract for the operation and maintenance of its high-voltage electrical power network.
It resulted in a £160 million handout to private shareholders to break the 30-year contract halfway through.
But the workers were brought back under London Underground management on different conditions.
This has had a knock-on effect on workers’ pensions and other entitlements—and bosses also expect them to take on extra responsibilities for no extra cash.
Dozens of PCS union members working for Transport for London (TfL) are balloting to strike alongside workers in the TSSA, RMT and Unite unions. The ballot is set to end on Wednesday of this week.
PCS says it hopes the workers will strike on the 10 July, when up to 1.4 million public sector workers are set to strike.
TSSA, RMT and Unite members have already struck twice against bosses’ plans to freeze wages and scrap their final salary pension scheme.
If they vote yes, the joint action would be the first involving four unions at TfL ever taken.