Public members of Network Rail are being urged to oppose any plans to pay bonuses to its executives.
The Transport Salaried Staffs Association (TSSA) has written to the public members ahead of a meeting saying they have a "simple moral question" to deal with following a critical parliamentary report into level crossing deaths.
TSSA general secretary Manuel Cortes has also written to Transport Secretary Patrick McLoughlin asking him to oppose any moves to increase base pay to replace bonuses.
Labour MP John Mann (Bassetlaw) has backed the union, saying: "It would be completely unacceptable for Network Rail executives to be paid huge bonuses just a few weeks after they were heavily criticised by Parliament for their attitude to the families of those who have died on level crossings.
"I called for a parliamentary inquiry into Network Rail following a young girl's death in Bassetlaw in 2012 because it was clear that hundreds of crossings throughout the country were unsafe, and Network Rail was failing to deal with the problem.
"I am now calling on Network Rail's shareholders to cancel all bonuses given to their executives this year, and indeed every year until safety is substantially improved."
NR said in a statement: "Network Rail's remuneration committee is currently working on a significantly different incentive package for the company's executive directors for this year and the years that follow.
"This new proposed scheme will be put to the company's members (shareholder equivalents) at the AGM in July."