The three-day walk out by maintenance and engineering workers was due to begin on Friday.Read more
Ahead of the Interserve shareholder meeting later today rail union RMT is calling for all its transport contracts - it has major contracts at Network Rail - to be brought in house.
General Secretary, Mick Cash, said both passengers and staff had been " left guessing".
"That is no way to run our transport services," he said.
"RMT is calling for immediate action to begin transferring the Interserve transport sector contracts in-house to avoid a repeat of the Carillion chaos.
"Once again we see the reality of bandit capitalism and its toxic impact on our public services. The time has come to end this obsession with the private sector speculators and return to the principles of public services run and owned by the public, free from this corrosive nonsense."