These former LIRR workers are riding the rails to Snitchtown.

Michael Dasaro and Gary Supper both pleaded guilty yesterday to faking disabilities as part of a massive $1 billion scam on the Railroad Retirement Board.

Dasaro and Supper face up to 80 and 60 years in the slammer, respectively, but Manhattan federal-court papers say they’ve promised to cooperate with the feds in exchange for leniency.

Both men also agreed to pay back about $235,000 each in crooked disability payments, according to court papers.