Mark Francow and his English bulldog named Sampson were enjoying a nice afternoon at a park in New York when Sampson suddenly darted off. Francow, a Suffolk County construction worker, searched for hours around the East Hampton park but failed to find any traces of his beloved pooch.

Unfortunately, Francow had to get back to work and couldn’t continue his search for the pup.

“He’s the type of dog that always returns,” he told The Post Thursday. “He would usually come back to my van.”

That’s because Sampson had made his way into a dangerous situation, wandering onto some nearby train tracks. Lucky for Sampson, a couple of Long Island Rail Road workers spotted him and brought him to safely.

Engineer Christian Beck and assistant conductor Vinny Fragale called to the dog, who was escaping the heat of the sun underneath the train’s engine.

“I could tell, like, ‘Oh he’s been out for a while, he just wants some shade,” Beck said. “I was thinking about like my own dog, like, you know, if he was left out. Or he had gotten out somewhere else, I’d be totally scared.”

Their train was scheduled to head up to Montauk, so the men loaded Sampson onto their train, gave him some water, and headed on their way. The crew then got busy posting pictures of Sampson and details of where he was found to every missing pets page on Facebook they could find.

It didn’t take long for word got back to Francow that his four-legged buddy had been found safe and sound. While arrangements were worked out to reunite dog and owner, Sampson seemed to thoroughly enjoy his train ride. Vinny Fragale shared:

“He followed me around the whole day,” the railroad man said. “When I was on the couch in the break room, he actually took a nap right in front of me. He just hung out.”

After a few hours on the train with the crew, Sampson was placed back into the care of Francow when the train returned to Bridgehampton a few hours lat

In a statement made by LIRR President Phil Eng, the crew were praised for the compassion and heroism:

“This act of heroism is another example of how our workforce is truly part of the community where they live and serve. Our conductors and engineers and other frontline workers are truly compassionate people who take pride in helping their Long Island neighbors. As a dog owner myself I am glad that our crew went above and beyond to rescue Sampson and connect him with his owner. I look forward to providing a commendation for all of these employees and working with our labor leaders to acknowledge the true spirit of the workforce.”

Francow plans on immediately getting tags made for the adventurous pup in the event he decides to run off on his own again.