Around 25 testers in the RMT transport union on the London Underground struck from Sunday night to Tuesday morning in a pay dispute.
The workers maintain critical electricity operations on the network, and are employed by a consortium of firms headed by EDF Energy.
Niall Lynch, the RMT EDF rep, told Socialist Worker, “This dispute is about winning equality and respect for our grade. The company paid day workers £3,000 each in return for being flexible and working beyond the end of their shift to finish a job.
“But shift workers were not given this money. The dispute has been going on for about eight years and we’re not prepared to put up with this any longer.
“Testers perform crucial safety work on the tube. We are responsible for some 250 sub-stations and all the tube stations. Yet the workforce has shrunk from 64 when the consortium took over to 25 today.”