RMT is pushing for a protective award for members made redundant at TXM after the company went into liquidation.
The union has been in contact with TXM Plant’s administrators to understand what steps are being taken to find a new buyer, or funding for the company.
However as the workforce were not consulted properly and only given statutory redundancy payments, RMT is now seeking a protective award for all its members.
If successful, it means workers could get 8 weeks extra wages on top of the statutory minimum they will be paid.
The Wigan-based supplier of road-rail vehicles was part-owned by private equity investor LDC and until recently had been making profits of £4m on turnover of £38.9m.
RMT argues that the proposed government cuts to funding for maintenance renewals has a direct impact on the Network Rail supply chain which TXM was part of.
General Secretary Mick Lynch said: "The way these workers have been treated is a total disgrace.
"The company hid the fact they were in financial difficulty and failed to consult our members despite the fact they were obligated to do so with the recognised trade unions on the prospect of redundancies.
"With private investors grabbing what they can and running out the door and government cuts to funding, what we need is a national strategy for proper rail funding and public ownership.
"We will pursue this matter legally in order to reach a just settlement for our members who have been left without a job through no fault of their own."