Part of a broader $2.4-billion effort to improve rail service in East Anglia; will sustain 1,000 jobs.
Analysts pegged the value of a possible merger, spinoff or sale at about US$5 billion.
Union says company will present an offer that could end strike.
Workers at Quebec rail plant join Kansas aerospace makers on the picket line.
Transportation giant will provide its FLEXITY platform tram technology to rail car subsidiary in China.